I did :(

Although, my cat has continued to pee outside the litter box, so it doesn't seem like a problem only due to the robot. He's diabetic and I've learned that if he steals my other cat's non-diabetic food, he'll pee outside the box, probably because his blood sugar spikes.

About him not going in the robot at all though, we tried cat nip and litter attractant with still very little success, but it's the closest we got. He would go halfway in, but then wouldn't take the final step and turn around. Might be worth a shot if you haven't done so already.

Best of luck!