I've tried them all. The very best that I find works for me and all the cats is a big, rubbermaid storage container. No holes cut in it, they just jump inside it and use it. One of my cats does not put his butt down all the way when he pees, which is what led me to this type of litter box. It works perfect. Even if he keeps his hiney up, it goes on the side. I have 4 cats and 4 litter boxes, and I scoop once a day, and once a week, I wipe down the sides of the litter boxes, push the litter to one side as I wipe down each side. Then, as long as you keep it topped off with quite a bit of litter, I can go a month before I have to take it out and hose out the whole thing. I like scoop away litter the best. It forms tight clumps, and as long as you don't try to scoop them when they are still wet (which is nearly impossible), I think it scoops the best. It is quite dusty, but it does settle and then isn't so bad. I have one cat that is older, and she has her own litter box that the others don't have access to, and for her, I jsut have one that she can step into, but it has high sides, since she can be one of those pee-ers that doesn't sit all the way and get the side of the box. She does have access to the other litter boxes though, the ones she has to jump in, and she can jump into those too without a problem, but she does seem to prefer the one she can just step into. I spend a small fortune on cat litter. About once a week, I top off the boxes, if you keep them pretty full, they don't get gross as quickly.