In terms of price-quality ratio, a good device. Was purchased after the robot vacuum cleaner. It’s really convenient to use in a pair, the floor became clean in the apartment, if I see stains in the kitchen, I run it for 20 minutes, and everything is cleaned from me. The functionality is as stated in the instructions, the fabric on removable disks is of better quality than the usual microfiber that comes with the robot vacuum cleaner.