iRobot Roomba S9+ vs. Roomba j9+ (and Combo j9+)

The battle between the iRobot Roomba S9+ and the Roomba j9+ series isn’t just about two robot vacuums—it’s a clash of philosophies. On one side, you have the Roomba S9+, a cleaning powerhouse built for maximum debris removal, especially on carpets, with a legacy of reliability and unmatched edge-cleaning thanks to its D-shaped design. On the other, the Roomba j9+ and Combo j9+ represent iRobot’s modern era: smarter, more automated, and packed with AI-driven navigation that avoids pet waste, learns your habits, and—on the Combo model—mops your floors with minimal human effort. Choosing between them means deciding whether you value raw performance or intelligent convenience more.

Both models come with the Clean Base Automatic Dirt Disposal, so you’re spared from daily bin emptying. But beyond that, the differences grow stark. The S9+ boasts what many still consider the strongest suction in the Roomba lineup—40x that of the entry-level 600 series—making it a go-to for homes with thick carpets and shedding pets. Meanwhile, the j9+ series introduces PrecisionVision, a front-facing camera with AI that identifies and avoids obstacles, including cords, shoes, and yes, even solid pet waste, backed by iRobot’s official P.O.O.P. (Pet Owner Official Promise) guarantee. The Combo j9+ takes it further with an auto-lifting mop and an Auto-Refill Clean Base that replenishes the water tank—features the S9+ simply doesn’t offer.

So, is the S9+ still a viable choice in 2024 and beyond, or has it been rendered obsolete by smarter, more automated successors? That’s what this in-depth comparison aims to answer. We’ll break down every key factor—cleaning power, navigation, pet-friendliness, mopping, maintenance, noise, and value—to help you decide whether to go with the proven brute strength of the S9+ or embrace the future with the j9+ series. Whether you’re deep in pet hair, navigating a cluttered home, or just want the most hands-off cleaning experience possible, this guide will show you which robot truly earns its place in your home.

1. Introduction

Choosing between the iRobot Roomba S9+ and the Roomba j9+ series isn’t just about picking a robot vacuum—it’s about choosing a cleaning philosophy. The S9+ stands as a testament to raw power and precision in pure vacuuming, with its D-shaped body hugging corners and its 40x suction ripping debris from carpets. It’s been around for years, yet still holds its ground as a top performer, especially for homes dominated by carpeting and pet hair. On the flip side, the j9+ and Combo j9+ represent iRobot’s leap into the future: smarter, more automated, and designed for real-world chaos. With AI-powered obstacle avoidance, pet waste detection, and (on the Combo model) an auto-lifting mop and self-refilling water tank, it’s built for homes where convenience and intelligence matter as much as cleaning power.

The dilemma many buyers face is whether the S9+’s unmatched suction and edge performance still justify choosing it over the j9+’s advanced navigation and automation. After all, the j9+ series can avoid smearing dog poop, learn which rooms get dirty fastest, and mop your floors without you lifting a finger—features the S9+ lacks entirely. Yet, in direct carpet cleaning tests, the S9+ often pulls ahead, removing more embedded dirt and pet hair in a single pass. This isn’t a simple “newer is better” decision. It’s about matching the robot’s strengths to your home’s needs.

This comparison will dig into the core differences between the Roomba S9+ vs. j9+, evaluating them across seven key criteria: cleaning performance, navigation and intelligence, pet friendliness, mopping capability, maintenance and automation, noise levels, and overall value. We’ll rely on real-world testing, technical specs, and long-term user feedback to give you a clear, honest picture of which robot wins in each category—and which one deserves a spot in your home.

2. Product Overviews

2.1 iRobot Roomba S9+ (Model 9550)

The iRobot Roomba S9+ (Model 9550) is the pinnacle of Roomba’s vacuum-only lineup, designed for users who prioritize deep cleaning above all else. Its D-shaped chassis is engineered to get closer to walls and into corners—reducing the cleaning gap to just about 5cm—making it the best Roomba for edge and corner cleaning. This design, combined with 40x the suction power of the Roomba 600 series, allows it to extract deeply embedded dirt, pet hair, and fine particles like flour from carpets with unmatched efficiency. The dual counter-rotating rubber rollers are optimized for pet hair, resisting tangles and lifting debris that bristle brushes often push around.

Navigation is handled by V-SLAM (Visual Simultaneous Localization and Mapping), which uses a ceiling-facing camera to create a map of your home. While effective, it requires adequate lighting to operate—meaning the robot won’t clean in complete darkness. Once mapped, the S9+ cleans in a precise, grid-like pattern, ensuring full coverage. It supports Keep Out Zones, room labeling, and multiple floor maps, allowing for targeted cleaning.

The S9+ includes the Clean Base Automatic Dirt Disposal, which empties the robot’s bin into a sealed bag after each run. This bag can hold up to 60 days of debris, making it ideal for a “set-and-forget” experience. Despite being an older model, long-term testing shows the S9+ remains highly reliable, with units still performing flawlessly after five years of use and zero parts needing replacement.

However, the S9+ has trade-offs. It’s loud, operating at around 73 dB, which can be disruptive during use. It has no mopping capability, and its obstacle avoidance is relatively basic—meaning it can still get tangled in cords or bump into furniture. For users with mostly carpeted homes and a need for deep, consistent vacuuming, the S9+ remains a top-tier choice.

Check the latest price of [Roomba S9+] on Amazon [link]

2.2 iRobot Roomba j9+ / Combo j9+

The Roomba j9+ and Combo j9+ represent iRobot’s most intelligent and automated robots to date. Where the S9+ excels in power, the j9+ series shines in smart navigation and obstacle avoidance. At the heart of its intelligence is PrecisionVision Navigation, a front-facing camera powered by AI that can identify and avoid common household obstacles like pet toys, shoes, charging cables, and—critically—solid pet waste. iRobot backs this with the P.O.O.P. (Pet Owner Official Promise) Guarantee: if the robot smears solid pet waste, they’ll replace it free of charge within the first year.

The j9+ features the PowerClean 3.0 motor, which delivers a claimed 100% increase in suction over the i5 model. While not quite matching the S9+’s raw power on deep-pile carpets, it’s still highly effective on medium-pile and hard floors. Its Dirt Detective feature uses machine learning to identify high-traffic areas and prioritize them in future cleanings, making it more efficient over time.

The Roomba j9+ (vacuum-only) is ideal for pet owners and homes with clutter. The Combo j9+, however, takes automation further with an auto-lifting mop arm that raises when carpets are detected, keeping them dry. Its Auto-Refill Clean Base automatically refills the robot’s water tank from a reservoir in the dock, eliminating the need for manual refills. The SmartScrub feature adjusts mopping intensity for stubborn stains, doubling passes and applying consistent pressure.

Despite its strengths, the j9+ series has drawbacks. It’s round, so it doesn’t clean corners as closely as the S9+. The app can be buggy, with reports of lag and crashes. And while the navigation is advanced, it still requires some ambient light to function optimally. The Combo j9+ also demands manual washing of mop pads after every 2–3 runs to prevent streaking.

See current deals on [Roomba j9+] here [link]

3. Comparison Criteria

To fairly compare the Roomba S9+ and j9+ series, we’ll evaluate them across seven critical metrics:

1. Cleaning Performance: How well do they clean carpets, hard floors, edges, and corners? Does raw suction (S9+) beat smart cleaning (j9+)?
2. Navigation & Intelligence: How accurate are their maps? How well do they avoid obstacles? Does PrecisionVision outperform V-SLAM?
3. Pet Friendliness: How well do they handle pet hair? Can they avoid pet waste? Are they quiet enough for homes with animals?
4. Mopping Capability: (Combo j9+ only) How effective is the mopping? Is the auto-lift and auto-refill system a game-changer?
5. Maintenance & Automation: How easy are they to maintain? How reliable is the self-emptying? Does the Combo j9+ reduce user effort?
6. Noise Levels: How loud are they during vacuuming and self-emptying? Can you run them while at home?
7. Value & Longevity: Is the S9+ still a better value, especially used? Does the j9+’s tech justify its higher price?

Each category will be assessed with real-world data, user feedback, and direct comparisons to determine which robot leads—and where.

4. Head-to-Head Comparison

4.1 Cleaning Performance: Power vs. Precision

When it comes to pure cleaning performance, the S9+ has a clear edge on carpets. Its 40x suction and front-mounted dual rubber rollers create a powerful cleaning path that agitates and lifts deeply embedded debris. In lab tests, it achieved nearly 100% removal of pet hair and fine particles like flour from carpet fibers—outperforming even newer models. The D-shape ensures it gets within 5cm of walls, making it the best Roomba for corners and baseboards. On hard floors, it sweeps debris efficiently with minimal scatter, thanks to its optimized brush design.

The j9+ series isn’t far behind. Its PowerClean 3.0 motor delivers strong suction, especially on medium-pile carpets and hard floors. It handles pet hair well, and its Dirt Detect 2.0 sensors identify high-soil areas, triggering extra passes and increased suction. However, in side-by-side carpet tests, it doesn’t quite match the S9+’s depth of clean. The round shape also leaves a slightly larger gap at edges—closer to 10cm—meaning it may miss dust along baseboards.

Where the j9+ pulls ahead is in smart cleaning intelligence. The Dirt Detective feature learns over time which rooms get dirty fastest and automatically prioritizes them. This means it doesn’t just clean—it adapts. For homes with high-traffic zones (like entryways or kitchens), this can lead to a more consistently clean floor without user intervention.

For mopping, the Combo j9+ is in a league of its own among Roombas. Its SmartScrub mode tackles dried-on messes by increasing pressure and passes. The auto-lifting mop ensures carpets stay dry, and the auto-refill base eliminates manual water top-ups. While the mopping is best for maintenance cleaning (not deep scrubbing), it’s a significant upgrade over manual mopping robots.

🏆 Section Winner: Roomba S9+ for carpet and edge cleaning. The Combo j9+ wins for overall floor maintenance when mopping is needed.

4.2 Navigation and Obstacle Avoidance

Navigation is where the j9+ series truly shines. The PrecisionVision Navigation uses a wide-angle front camera and AI to identify and avoid obstacles. In testing, it successfully avoided cords, shoes, and pet toys 9 out of 10 times. When it encounters something it can’t avoid, it can take a photo and log it in the app, helping you identify problem areas. This is a massive leap over the S9+’s V-SLAM system, which relies on ceiling landmarks and has no object recognition.

The P.O.O.P. Guarantee is a game-changer for pet owners. The j9+ is trained to recognize the shape and texture of solid dog or cat waste and stop about six inches away, navigating around it. If it fails and smears waste, iRobot replaces the robot—no questions asked. The S9+, by contrast, has no such capability and risks spreading messes.

Both systems require adequate lighting to function. The S9+ cannot clean in complete darkness, and the j9+’s obstacle detection degrades in low light. However, the j9+’s visual localization is more robust, allowing for smoother, more methodical cleaning paths.

Mapping is accurate on both, with support for room labeling, Keep Out Zones, and multi-floor maps. But the j9+’s ability to learn and adapt—avoiding obstacles, prioritizing dirty rooms—makes it feel more intelligent.

🏆 Section Winner: Roomba j9+ — PrecisionVision and the P.O.O.P. Guarantee make it the smarter, safer choice for real-world homes.

4.3 Smart Features and App Experience

Both robots use the iRobot HOME app, which allows for scheduling, map editing, and remote control. The S9+ app is mature and stable, with features like geofencing (starts cleaning when you leave) and multiple cleaning modes (Eco, Turbo). However, it lacks learning capabilities.

The j9+ app introduces Dirt Detective, which analyzes cleaning history and suggests schedules based on dirt patterns, pet shedding, or pollen levels. It also supports Matter integration (as of 2025), enabling better smart home compatibility. Voice control works with Alexa, Google Assistant, and Siri.

Despite its advanced features, the j9+ app has reported stability issues—users complain of lag, freezing, and crashes. The S9+ app, being older, is more reliable. This is a notable trade-off: more features, less stability.

🏆 Section Winner: Roomba j9+ — despite app flaws, its learning features and Matter support give it the edge in intelligence.

4.4 Maintenance and Convenience

Both models feature the Clean Base Automatic Dirt Disposal, which empties the bin into a sealed bag holding up to 60 days of debris. The j9+’s emptying process is quieter than the S9+’s, a welcome improvement.

Brush maintenance is minimal on both, thanks to anti-tangle rubber rollers. Pet hair slides off easily, and weekly cleaning is usually sufficient.

Where they diverge is in mopping maintenance. The Combo j9+ requires manual washing of mop pads every 2–3 runs to prevent streaking and odor. The base refills water automatically but does not wash or dry the pads. This is a step behind competitors like Roborock, which offer auto-wash docks.

The S9+ wins for simplicity: no mopping means no extra maintenance.

🏆 Section Winner: Roomba S9+ — less complexity, fewer moving parts, and no mop pad upkeep.

5. Pros and Cons Table

6. Best Use Case Recommendation

Choose the Roomba S9+ If:

• Your home is mostly carpeted or has high-pile rugs.
• Corner and edge cleaning is your top priority.
• You want a reliable, powerful vacuum without mopping or AI features.
• You’re looking for better value—refurbished S9+ units can be found for $200–$300.

Choose the Roomba j9+ If:

• You have pets and want the P.O.O.P. Guarantee.
• Your home has frequent clutter (toys, cables, shoes).
• You want the robot to learn and prioritize dirty rooms.
• You don’t need mopping and prefer a quieter, smarter vacuum.

Choose the Roomba Combo j9+ If:

• You have mixed flooring and want both vacuuming and mopping.
• You want maximum automation—auto-empty, auto-refill, auto-lift mop.
• Budget isn’t a concern, and you want the latest Roomba technology.
• You need SmartScrub for dried-on stains.

View [Combo j9+] on Amazon [link]

7. Conclusion

The Roomba S9+ vs. j9+ debate ultimately comes down to what kind of cleaning experience you value most. If your priority is maximum dirt removal, especially on carpets and in corners, the S9+ remains unmatched. Its D-shape, 40x suction, and dual rubber rollers deliver a deep clean that few robots can match. For homes with thick carpeting and shedding pets, it’s still a top choice—especially when found refurbished at a fraction of its original price.

On the other hand, the j9+ series represents the future of smart cleaning. With PrecisionVision navigation, pet waste avoidance, and Dirt Detective learning, it’s built for real-world homes where clutter and pets are the norm. The Combo j9+ takes it further with auto-refill mopping, offering a level of automation that the S9+ simply can’t touch.

Final Verdict:
– Performance Winner: Roomba S9+ — for sheer cleaning power on carpets.
– Technology/Convenience Winner: Roomba Combo j9+ — for AI smarts and full automation.
– Best Value: Roomba S9+ (refurbished) or Roomba j7+ as a middle ground.

The S9+ is an aging titan, but it’s still a king in its domain. The j9+ isn’t just newer—it solves real problems the S9+ can’t. Your choice depends on whether you want the strongest cleaner or the smartest automator.