Robot vacuum cleaner. On the plus side, it’s a good fantasy: you set the thing free, go off to work, and come home to a clean floor. On the minus side, it’s about the size and shape of an anti-tank mine.
On the other minus side, the cat would hate it. Having said that, I can’t keep track of all my cat’s grievances anyway (neither can she, I suspect), so I’m sure one or two more added to the pile won’t make all that much difference. Much as she will try to convince me otherwise.
On still another minus side, the FAQ gives one pause:
Can Roomba's music or sound be changed or disabled?
No, Roomba's music and sound effects cannot be modified or disconnected.
More proof here of the uses of early adopters. Thanks again, early adopters!