I've been using this one for years. It's mahhhhvelous. You have to clean the litter box yourself manually. I just use non-clumping and dump it out every two weeks. It has a hole in the side they enter through, then a grid they walk across. At the far corner of the grid there is another hold through which they enter the little box below. The litter box is a huge Sterilite plastic box you buy for about $5.00 at the dreaded WalMart. I have two real "kickers" but they can't kick it over the high sides of this box, AND it's contained within the privy. They then go back up through the hole in the grid and walk across the grid to the exit (removing the litter from their feet as they god!) I have no odor, no litter on my floor and no spraying on my walls.
I have had this same unit for over five years. I have two very large male cats and the grid only recently broke. They shipped a new improved version (stronger) for about $16.00. The rest of the box is in tip top shape.
I own the upright model in "Oak" for about $140.00 Their website is:
http://www.pfprivy.com/
There is also a Hidy Tidy enclosed litter box. The design is more suitable for your living room, but they don't have the grid. For me, I have to have that grid. It really gets the litter off their feet. Hidy Tidy's web site is:
http://www.hidytidy.com/
Hope this helps someone else.