I had the very large Booda Dome - the one with the ramp inside to cut down on litter tracking. It took up lots of floor space, but I was extremely happy with it.After 1 of my 2 cats passed away I decided to get this box, as I live in a small apartment. I was so sure that this one would work as well as the huge one that I immediately tossed it out.Big regret!!Even though my cat is not large (he's 8-9 pounds), it is so small for him that his [...] hangs out the door on a regular basis when he goes potty.I have started piling the litter up high on the side opposite the door, leaving a tiny bit on the floor of it on the door side, and that seems to help. I still have to clean it twice a day to RE-pile the litter up so he'll turn around so his [...] is inside.I REALLY regret tossing the larger box! I'd much rather give up more floor space than clean up the mess that this one is causing.