Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Have owned three; probably won't buy a fourth

I want to like this device, I really do. When it works, it's a dream come true for those (like me) who hate to clean litter boxes. Within my experience, however, "when it works" is a serious issue. All three of the LitterMaid boxes I've owned (one regular, two Mega) have broken down beyond any hope of field repair within a couple of months after the warranty expired. Customer service is next to useless for any significant problem; expect a lecture on selecting the proper litter no matter what you're calling about. Also, nobody I've talked to had any idea of how to order parts beyond a replacement comb. The bottom line is that these things are just too expensive to factory-repair or replace every 12-14 months, and I'm not going to do so a third time. If they extend the warranty to three years or so, I'll reconsider.