5 years with the Litter Robot, Kristie. My kids and I enjoy it. I buy litter every two months, which is. My house NEVER smells like litter and it cleans after every use.
These were taken when they first met the litter robot. I used some of their own (smell) litter from their old box and this introduction worked like a charm. It's the only thing they use.
I have had the Litter Robot product for 10 years now. I started out with the LR2 Bubble and I used that one for several years until I purchased the LR3.