The roller brush unit in this design sits so deep in the body that it can't even come close to 'cleaning' the surface. I say almost half an inch. So if you enjoy watching the brush spin but aren't really involved in the work, then this is the product for you. Another reviewer posted the same observation, but I thought they might be delusional. they weren't. I doubt this is really a genuine Bissell product. Either way, it's a waste of money.