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I bought one years and years ago (when the 3 was brand new). I wouldn't recommend it, and have transitioned to a non-mechanical litter box. I would have said I liked it for the first nine months or so.

1. The mechanism is fairly finicky. Every 3 or 6 months it would jam, and require some debugging. It's mechanically not as simple as I would hope.

2. My cat developed a UTI, and it was hidden for longer than it should have been because I was not watching the litter box as closely as I would if it required more frequent cleanings.

3. After 16 months it developed a smell that was very hard to clean. I spent a week with it disassembled, washing the many bits and bobs, letting it dry and checking the results. It was broken into more than a dozen small pieces, but a few of the pieces were stubborn. Afterwards, it needed this deep cleaning about every 9-12 months. Traditional litter boxes can be cleaned very easily with hot soap and water. Traditional boxes require more frequent upkeep, but I find the task to be less stressful with very little cognitive load.