We just got cat #3 on Friday. This one is a little kitten.
I told my wife that there is no way I can keep up with the litter box duties with 3 cats so it was time to get an automated litter box. My thought was the Litter Robot as well.
I see they are now on version 4. I looked at these last summer and they were only on version 3 and they were $100 cheaper. $649 now - ouch.
Last year I did a LOT of checking out of various automated boxes and the Litter Robot always ranked the highest. Their 1 (big) drawback is they don't hold a lot of used litter/waste. With 3 cats I expect to have to tend to the cleanup 3 or even 4x/wk. I wish the storage was larger.
Still debating it myself. If I pull the trigger I'll let you know my take on it; I ask the same from you. But... they won't be shipping (at least not version 4) until some time in July (with my luck, it's LATE July).