The Roomba doesn't clean as good as I could, doesn't clean as fast as I could, and doesn't clean as cheaply as other products could. But I live in a house with laminate floors, two dogs, and a cat. Trying to keep up with their fur is a losing battle, so I'm more than happy to spend $300 once and have something that will run every day and keep the fur off the floor.

It's not replacing a normal vacuum, anyone who thinks so is fooling themselves. It's to keep your house cleaner in between normal deep cleans.