I second nominating CG, especially if they have their own bathroom already! If you have the space, and you think your cats wouldn't something a little smaller than crystals but definitely bigger than clay (and NO DUST), I'd give it a try. I've used the LR for about a year and just finish acclimating my cats to the CG two weeks ago and ... I'm... so... happy. With LR, I STILL had to deal with litter, not to mention cleaning the LR which is no easy feat, but mainly dust dust dust everywhere! And then SOMEONE had to open the drawer and inhale all that stale, week-old waste to throw it away and put a new bag in. The drawer never smells nice, the globe was a pain to clean, and there was still litter everywhere (including our bed! AH!).
I hate litter so much. Crystals probably would have worked better, do your cats like crystals? But in any event, I'm so extremely happy with the CG that sometimes I sit and look around the house (and it's clean floors which wasn't the result of me running the Roomba just a minute ago) and just smile serenely.
viewtopic.php?f=14&t=1739 is a journal of what it took to set up and acclimate our cats, in case you're looking for people's experiences with the products. It wasn't easy, but they're barely two years old, I think it was worth the two weeks of acclimation and effort in setting up for a nice long lifetime of no litter or even hauling cat waste!
The downside, of course there's a downside, is that you WILL smell poop until it cycles. There's no odor control whatsoever. Even so, my two cats only poop every 24-36 hours, and I run the CG twice a day anyway. If there's poop, I cycle. At most, I'll have to run it three times a day, and that hasn't happened very often. I like to run it right before I go to work and before I go to sleep - if it has poop between coming home from work and going to sleep, I just run it again. So, I have to stand the smell for about 10 minutes (the time it takes for it to scoop and drain the first time) and then it's Sani-Solution. I can handle 10 minutes, if it means I don't have to ... well, physically handle the waste itself
