We put the Roborock S8 Pro Ultra (S8 Pro Ultra) head-to-head against the iRobot Roomba j9+ Combo (Roomba j9+ Combo). Below: detailed spec comparison, pros and cons, and our verdict on which is the better buy right now.
Spec Comparison
| Roborock S8 Pro Ultra | iRobot Roomba j9+ Combo | |
|---|---|---|
| Runtime | ~180 min | ~180 min |
| Dustbin | 350 mL (self-empties to dock) | Self-empty (60 days) |
| Suction | 6000Pa | Power-lifting (2x j7) |
| Filter | Washable E11 HEPA | High-efficiency HEPA |
| Navigation | LiDAR + ReactiveAI 2.0 | Imprint 2.0 |
| Coverage | Whole home LiDAR mapped | Whole-home multi-floor mapping |
| Weight | 4.4 kg | 3.4 kg |
| Smart Features | Reactive 3D obstacle avoidance, auto-empty/wash/refill dock | Imprint 2.0 |
Pros & Cons
Roborock S8 Pro Ultra
Pros
- Hot-water mop pad wash is unique
- Mopping actually scrubs (VibraRise)
- Full-base ecosystem
- 6000Pa suction
Cons
- Base is huge (deep footprint)
- App can be complex
- Pricey
- Replacement mops/filters subscription-like cost
iRobot Roomba j9+ Combo
Pros
- Auto-refill mop is a game changer
- Excellent obstacle avoidance
- Best-in-class carpet detection
- 60-day bag is enormous
Cons
- Very expensive
- Mopping vs dedicated wet-dry is mid
- Replacement bags/filters add up
- iRobot sold to new owners — service uncertainty
Our Verdict
It’s a genuinely close call. Choose the Roborock S8 Pro Ultra if you prioritize raw performance and build. Pick the iRobot Roomba j9+ Combo if value-for-money and practical features matter more. Either is a confident buy.
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