Sorry, I had bad experience with it.
Don't know what the deal was, maybe the litter I used wasn't good enough. I did buy the super clumping one as it said on a box. Well the first couple of days I've had it it was ok, after a while it would get stuck in the middle, smear poop all over, was messy and a real pain to clean up. To me, I figured with all the work I had to do to clean it and make sure it works, wasn't worth the extra money investment. So, I took it back.
What I am really excited about is the litter-robot. It's a bit more expansive, $300 + but it's kinda neat. Check it out at www.litter-robot.com
Anyone had experience with that?