I'm going to update this thread.
I had the chance to get a Litter Robot II with the bubble for a steal here locally and decided to give it a go. I've been dying to try one of these boxes for forever, but due to the cost-- I always put it off. As someone said, will it really reduce the number of boxes you need in the house?
Well, here are my results. One-- the bottom tray doesn't even need to be cleaned because it's completely covered with the trash bags I use. I'm not using their bags-- I just put a small trash bag over the entire tray and slide it in. Two-- both my F1, Una, (baby-- 6 pounds now, but very tall-- as tall as a normal domestic shorthair already) and my F7, Saber, are using it. Three-- it seems to be the ONLY box they are using in the house. I have four boxes in the house and the LR is being used consistently. I'm not sure where my old lady DSH is going, but she's 14-- she can use any box she'd like.
I have found two poops outside of the box in the past two weeks-- I am wondering if one cat was in the box and the other was doing the potty dance? This requires some investigation.
I will say if you are a breeder-- this could be a godsend for kittens. I find myself dumping whole litterboxes on a daily basis with litters of 4-5 kittens and instead, I could just hit a button, cycle the box and then go about my day with the LR. I am seriously considering getting a second one just for this purpose.
The big bad thing is that the LR does not hold the litter when a cat is scratching. Paige alerted me to a little wall that can be added to the LR and I will need to get it. Looks like a litter party some days.