Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Waste of money!

I bought this because I thought "I have to have one." It has been the most aggravating thing I have ever used! You twist and sometimes it twists and sometimes it doesn't and it doesn't take away odor, etc.... I heard the diaper champ is much better,or better yet, just dispose of the diapers immediately and dont buy this at all. I have a whole stack of refills that are sitting on the closet shelf.