I do not like the Litter Maid. The fine sand litter I have to use stinks something awful after one use.
I have a better, cheaper idea. Use a regular litter box with clumping litter. When you change the litter, dump it out, scrape the bottom and then pour in a 1/2 to 1 cup of white vinegar. Swish it around, pour the vinegar into the bag with the used litter and wipe down the litter box with some paper towels. The stink will be gone.
One of the reasons I hate the self-cleaning litter boxes is that they are so cumbersome to clean.