I've only had this device for a little over a month, but I can immediately see it's helping. As I leave the house, I make sure the vacuum is unobstructed and turn it on. crossing the threshold from room to hall with assurance (about 2cm). When I go home, I'm going to clean up. This vacuum cleaner is purely for preventative maintenance, but it's money well spent. I don't regret buying it one bit.