Tycho on the Littermaid Plus

Tycho of Penny Arcade gives the smackdown to the Littermaid Plus automatic cat box.
Cat pee and litter is like wet cement, it's like a new state of matter. In an ordinary, non-robot litter box it has time to "set" so that you can remove it and then go do something that is important to you. If, on the other hand, a mechanical arm reaches out and spreads it the length and breadth of the device, now you have a completely disgusting new task you could never have imagined in trade for the one you thought you were giving up forever.

I have a lot of people who swear by this thing, but when we tried it, it just didn't work. Tycho's exprience mirrors mine exactly.