I was extremly impressed with the shark performance for the first couple of weeks. After about 3 weeks, the shark starts grinding the cheap plastic gears because a little pressure is applied to the nose of the sweeper. The machine now makes a constant grinding noise due to broken teeth on the gears. I was pleased with the wall edge sweeping "technology" and also liked the cordless design, but the product is too cheap and has many many flaws. I do not recommened this to anyone. ...