I have a Litter Robot and it's working well so far. My 5 month old kitten has been able to use it right away without any trouble. The price is a little steep but it does make life easier. All in all I would buy another one if I had to. Remember, the primary purpose of a self cleaning litter box is to give your cat a clean litter box every time so there is less chance of litterbox problems and not neccesarily to give us total freedom from litterbox chores. Having a constantly clean litter box makes our cat happy & thats what we should be most concerned about.
The manufacturer now offers a payment plan for those interested in buying a Litter Robot.