Comment by rdoherty
It will hold my coffee at the perfect temperature all day. Also if the battery runs out I can put it on its charger and after ~5 mins it will start heating my now cold coffee back up to temperature. I thought it was kinda gimmicky too before I bought it but I am surprised at how great it is to have perfect temp coffee all the time.
Why do you take all day to drink a coffee? Mine is definitely gone by the time it gets cold in an insulated mug.