Robot - exactly,
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This review is from: iRobot Roomba 521 Vacuum Cleaning Robot (Kitchen & Home)
The idea sounded brilliant. I packed my hoover away and was looking forward to a life of no hoovering. Wrong. It gets stuck all the time, pet hairs and other fluff get the brush clogged up and you spend more time taking it apart and cleaning it and freeing it from trapped debris than it would take to hoover through the house with one of your old trusties. Wouldn't buy it again.