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Los Angeles resident Ruth Horne, 76, enticed by a bargain, bought what she thought was a Roomba to vacuum her house, but the experience ended in frustration.

“It kept getting stuck somewhere and would then just go around in circles,” Horne said. She realized it was a cheaper knock-off.

Meanwhile, Marcy Lewis, 75, of Madeira, Ohio, had been wanting a robot vacuum cleaner and deliberately chose a knock-off.