Instruct: Classify a given Amazon review as either positive or negative.
Query: Favorite coffee mug of all time!

This mug surprised me so much! I can put coffee in it when I wake up in the morning and still have it piping hot in the afternoon! I can't even believe how well it keeps the heat in.I also love the fact that you can hold it in one hand and use your thumb to push the button for release of the coffee inside, and it pours smoothly out into your mouth. Definitely will buy one again!