I've used Roombas for years, and this new one is my first disappointment. The vacuum portion works as expected, but the mop is a practically useless feature that looks like iRobot just added on to try to compete with other manufacturers. In mopping mode, the j7+ has 3 emitters that release the cleaning solution onto the floor ahead of the mop. Well, the mop pad barely touches the floor, and certainly not with enough force to do any cleaning. In fact, it leaves 3 distinct wet trails behind as it's cleaning. After going over my entire kitchen floor, the mop pad isn't even wet all the way across, it's only slightly damp in the 3 paths where the emitters are releasing liquid. Please, save your money and get a Roomba without the mop.