We have this one.
It is almost perfect.
The cat likes it, and we have to clean the box about once every 7-10 days.
Sometimes, the area where the box goes gets a bit dirty, particularly if you wait too long to empty it. Wipe it with a Clorox wipe, replace the bag, and you're back in business.
Uses WAAAY less litter. Just add a bit of litter each time you empty the poo bag.
It also monitors the cat's usage and weight and it sends a message. This is a very nice feature if you are worried about your cat's health or weight.
At $500 on Amazon, it is an absolute must-buy right now. With a coupon for $121 off, it is a no-brainer.
https://www.amazon.ca/Self-Cleaning-..._source=1&th=1