I wanted to cut down on the amount of coffee I drank and realized one of the main reasons why I top-off is because it cooled down. Once I got my mug warmer I can now happily sip my cup of coffee throughout the day and it keeps it at just the right temperature. Not blazingly hot but just under that. I've been using it 5 days a week 10 hours a day for 2 months and it has been a solid performer.