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Anyways. Huge timesave, and that $450 price ain't bad either. I do have issues with signals sometimes. We have two towers. It divides our place into 3 units to be cleaned one at a time. Sometimes, roomba won't cross into the next unit, or won't return because of all the wi-fi and what not interference. Still, not a huge deal. And Bob has never fallen down the stairs, although at times he dips a wheel over the edge and requires human assistance.