Hi Diane :)

We use (right now) only Boodas. Our kitties prefer them far more than any
other kind we used. I've tried the three level pan where you pick up the top
one, discard the stuff that stays in after it sifts, and then clean, put it
on the bottom and you're ready go. We also have, and used when the cats were
kittens, the standard litter box. But both boys prefer the domed Booda.
We have the one that has the odor guard and *I* like that!

Our little guy sits on top of his litter pan and watches the older kitty eat
across the laundry room LOL He knows hierarchy apparently.

Good luck!
Laurie