you can also set up perimeters so it stays in certain areas and doesn’t fall off steps. i have both the roomba and scooba but never use them. they’re noisy and they scare the heck out of my dog. a lot of people love them (i pretty sure sharon is one of them), but for me, it doesn’t work. maybe if i was away from home a lot, i’d just set the timer to go when we weren’t here i would have a different opinion, but they’re just sitting there gathering dust.