I have one it works, just. I have 2 cats and they both use it, but litter goes everywhere, (probably better with the tent, but we don't use one). Poo does get caught from time to time. If you are fastidiously clean, the littermaid will drive you nuts. It is noisy but we all get used to it. I have it set up in the spare bathroom. Needs preimum cat litter, haven't found a premium one that dries rock hard. You still have keep a daily eye on it, and have a scoop handy for any lumps that did not rake out, or for the smelly ones that get caught (helps if you lightly spray the rake with non stick cooking spray). The rake is often too short and the cats dig deep, and the litter is not hard enough, so often you find that it has just taken the top off the clump, instead of scoop it up. So you do have to keep an eye on it - def not maintenance free. But with two BIG cats I can empty the box every three days. I use a safeway bag as a liner for the dispisable box, so that extends the life of the box. I give it about 7 out of ten. It hasn't solved all my cat woes, but it's better than the daily poop-n-scoop.
K
PS. make sure you tell cat sitters, the last one thought that it would do it all for her, and we had a big build up after one got stuck, the thing got so chocked, that I think it blew a valve or something - it was never the same. Had to throw it out and buy another one.

that was before I heard about the litterfree. I'll monitor discussion, but no litter to track/schlep is a big seller...