Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DO NOT BUY THIS

When we first bought this unit we thought it would be great. We had the older Litter Maid that lasted about 4 years before it finally broke down so we bought this as a replacement. It worked great for the first few weeks. After that the gears would slip and it sounded like there was a toy uzi going off in my bathroom. It would get stuck and just sit there and click. The older model's rake arm would just retract while this one would just keep trying and the gears would just keep clicking. I bought the Ever Clean premium litter that costs $20 a box and when that didn't seem to work, I bought the Litter Maid premium clumping litter, which didn't make much difference either. This unit does not work for a long period of time. BUYER BEWARE.