A robot vacuum cleaner? I have to admit I was a little sceptical at first. It sounds like a great idea in principle, but surely a robot cleaner would be clumsy? Wouldn't it bump into the furniture and leave scuff marks on the skirting board? How would it negotiate its way under the new coffee table I've just bought? What about the stairs? Most importantly, would it freak the dog out? Would he follow it around the living room barking at it and trying to trip it up?