Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Doesn't work and will cost me $20 to return

Bought this because they were advertising the model that Stanley says will keep hot beverages hot for 24 hours. Wouldn't even keep coffee WARM for 2 hours. Total rip off..... Altrec said it was a warranty problem? It was brand new supposeable. You know the story. Last purchase for me. I'll stick to local stores.