I got one for Christmas. It's pretty cool. Works well for weekly upkeep, but I wouldn't recommend using it if your floors are really dirty. And if you're a girl with long hair, be careful. If there's a lot of loose hair on your floors, it gets caught up in the brushes and is a pain in the butt to get out. But overall, it's a cool (and functional) toy. The "walls" are just infrared beams to keep the Roomba from going anywhere you don't want it to go.
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