Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Huge disappointment!

I upgrade my Mega Litter Box with this newer model and I'm so sorry I did! No matter what kind of deluxe clumping litter I use, It gets globbed up behind the rake and I have to manually scrap it out. So what's the point??? If I don't manually do it, the smell is awful and I've added baking soda, litter box deodorizer, you name it, nothing works! Big waste of money!