We looked into buying one some years back when we still had our Kitty. Pretty expensive ($400?) and had a reputation of not lasting, though that was ten years ago or so and the technology has probably improved. We got by with the old standby cat box and clumping litter, cleaning it every evening. The cleaning itself got to be sort of a ritual. I'd say, "let's clean your cat box, Kitty" and she'd run to where it was located, "supervising" while I cleaned it out.
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