IRobot
Irobot Roomba ripoff, they warranty it for a year but if all you get is duds then you are out of luck
I have had 4 machines replaced in a year, the fourth is broken and after they fix or replace this one my warranty is up and other than phone help I would have to pay for a replacement. The track record for this machine doesn't give me hope that a fifth replacement will work any longer than a month ...