Have to say I disagree about the Ember mug. It's a little bit like the warmer setting on a diner coffee pot, the coffee will stay warm a long time but won't nec

Have to say I disagree about the Ember mug. It's a little bit like the warmer setting on a diner coffee pot, the coffee will stay warm a long time but won't necessarily stay fresh. And if you drink your coffee with milk the Ember mug starts to develop a film along the sides of the cup after about 30 minutes which is kind of unappetizing. You also have to keep it charged on the stand in between uses so you can't put the mug away in the cupboard (unless you have an outlet in your cupboard). I stopped using it and now just use a Yeti tumbler. It keeps my coffee hot for at least 2-3 hours which is long enough for me, without any of the downsides of the heated cup.