I wanted to see how long this mug could keep my coffee hot and it did not disappoint.  I checked it every hour for eight hours and it was still piping hot after 8 hours.  I really like the one button push to drink instead of having to unscrew the cap like other mugs.  It is very easy to drink from one handed.  The only negatives I can say is it is not dishwasher safe and my nose would press against the open lid while drinking.  If not for the last issue, it would be beyond 5 stars.