My hubby got me the mug for Christmas, now I can have the right temperature of tea all day or night. I did purchase a extra couple of coasters so I could have the mug in my office or bedroom also. 

I do have a suggestion, I would love to see a coaster that fits in the cup holders of the car with a USB plug so I can have my right temperature tea even when traveling. 

Love my Ember, Sheryl