My favorite part about the roomba when I had it...It sat in its little dock, and the cats apparently liked walking on it, including stepping on the on button on the top of the machine. It was always a nice surprise to come home and find that the cats had vaccumed. Of course the roomba always ended up in one of the back bedrooms, too lost to find its way back to the dock. And it always ran out of battery charge while it was way back under the bed.