Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Complete rip-off

I ordered this because I have 2 cats and wanted to make litter-box changing easier. I didn't like the first ones I got because they smelled worse than just plain litter with the liner. I re-ordered because I read that the product had been improved with baking soda. I noticed no difference. Plus, if I used clumping litter it just stuck to the bottom of the box. I was very disappointed.