iRobot Roomba Combo j9+

The Combo j9+ is perhaps the most divisive robot vacuum on Reddit. Its retractable mop mechanism — which lifts the entire mop pad to the top of the robot when it detects carpet — is genuinely praised as the most elegant solution to the carpet-mopping problem. No other robot achieves this level of carpet protection. Combined with iRobot's excellent rubber extractors, it's a capable vacuum.

However, the value proposition is savaged in nearly every thread. At $1100, it doesn't include a self-washing dock — you must manually wash the mop pad after every clean. Competing robots at this price (or even $400 less) include self-emptying, self-washing, hot water cleaning, and stronger suction. The mopping itself is described as basic — light pressure, no spinning or vibrating — more of a damp wipe than true mopping.

The Combo j9+ is recommended almost exclusively for iRobot loyalists who want the retractable mop feature and value the ecosystem (smart home, P.O.O.P. guarantee, US support). For everyone else, Redditors overwhelmingly direct them toward Roborock, Dreame, or Ecovacs for dramatically better features per dollar. The lack of a self-washing dock at this price is described as the single biggest product gap in the current robot vacuum market.