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Roomba - $60
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Nothing is wrong with it, I just replaced it with a model with lidar that can see.
This one's a bit dumb, it has no vision and it tries to map your house by just bumping into stuff, and then goes in lines back and forth after it learns where the walls are. Priced low because it's honestly overpriced by iRobot(250 msrp). Eufy makes much better vacuum robots for the pricepoint.
https://www.irobot.com/en_US/roomba-vac-essential-robot/Q011020.html