I thought this would be gimmicky but I got it as a gift and I now love it and use it daily. The only problem is the size. Who drinks 12 oz of coffee? Now I have to make a pot at home, fill this 12 oz, then pour a mug at home and drink it fast before I'm on my way to work. They need to increase the length and the top half diameter by a little to get to at least 16 oz, but 18 oz would be better.