A vacuum cleaner that works alone, on paper it's great. In practice it is another thing. The iRobot works alone, making a lot of noise. It requires a good hour and a half to suck forty square meters. Do not let the son of trainer (computer, charger, etc ...) because even if it has a system to not semmĂȘler brushes, accidents can happen. I sometimes use my traditional vacuum cleaner (once a month) to spend in places that iRobot forget. A purchase to mature before going into action!