I received this warmer as a Christmas present and used it for 2 days. After 2 days, the coating on the warmer plate bubbled and peeled off.  I exchanged the mug warmer for another one and used the warmer for one day and the coating on the warmer plate is also bubbling and peeling off.  I will return the mug warmer but not to exchange but to get our money back. Very disappointed in the quality of the product.