Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Only worked for a little while.

This product worked great for 2 or 3 weeks! That was the end of it. The litter started being removed with the clumps and the plastic started to break. I had ordered this early so I would be prepared when bringing home the kitty so now the time has passed and it is not worth the trouble to return it. It is a great concept but just did not work very long. Don't waste your money!