Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Underpowered.

This is the second littermate we have and the quality has gone downhill. The first one was great, the only problem being my girlfriend kept getting more cats and it was the smaller model so we gave it away and got the newer, larger model. It worked well for a few months, but then stopped scooping the poop into the bin. It leaves a pile at the end of the box which really annoys one of our cats and he takes it out on us by pooping on the floor next to the box instead of going into the dirty thing.Stay away from this model.