I never thought I would love a mug that stays warm as much as I do. This Ion mug with charging coaster is the best!!! I love having warm tea to drink all day, especially when the weather is cold. My husband loved it as well! He was amazed that it actually kept his coffee warm all day. The mug and the charging coaster were easy to use and the temperature was perfect. I need to buy a second one for my husband now.