Automatic Litterbox Central

I'm in the market for one of the larger units. I saw something at my local pet warehouse company that said "LitterMaid Ultimate Edition". (I was comparing their prices to Amazon.) I can't find anything called that, but it looks a lot like the Elite Mega in black. They also had the regular Mega (LM900). In both cases Amazon was cheaper and since I have Prime I will probably go that route.

So my question is: what's the conventional wisdom? It sounds like the 9250 is fail, what about the 9000? Any reason not to get that over the 900?