Roborock S8 MaxV Ultra vs Roomba Combo j9+

Roborock wins on performance, Roomba wins on value

The Roborock S8 MaxV Ultra ($1,799) and iRobot Roomba Combo j9+ ($699) represent premium vs. mid-range — and the $1,100 gap reflects real capability differences. Roborock wins on cleaning performance across every dimension: 10,000Pa vs ~2,500Pa suction, 3D structured light obstacle avoidance (works in the dark) vs Roomba's camera system (degrades in low light), 180-minute battery vs 75 minutes, and automatic mop washing/drying vs a fixed mop pad that you replace manually. The Roomba j9+ wins its category decisively with its unique retractable mop — the only robot under $800 that automatically lifts the mop pad onto carpets so you never have to remove it manually. For buyers who want the best cleaning robot and have the budget: Roborock. For buyers with a $700 limit who want premium features including a retractable mop combo: Roomba j9+ is exceptional value.