I received one of these mugs for Christmas. At first I thought it was gimmicky and overpriced. I had never seen one before and after my initial thoughts, I decided it was actually kind of a great idea! I live through freezing winter temperatures in winter. You have the heat on all you want in the house, it generally makes no difference. Everything is ALWAYS cold. So imagine my frustrations when I pour my morning coffee, nice and hot into a regular ol' mug and not even 10 minutes later it's cold! I hate when my coffee goes cold! My spouse obviously knew this about me and has seen more poured out cups of coffee than anyone on earth probably. His decision to buy me this mug was a game changer! Its sleek, lightweight, easy to use, but best of all, I never pour out coffee from this baby because it keeps the temperature just perfect. This is the mug Goldilocks would drink out of. It's absolutely the best kitchen gadgets I own. Buy one. You won't regret it.