I like my tea very hot and was worried that the unit would just keep it lukewarm like other cheaper versions. However, much to my surprise, it really works to keep your beverage hot as long as it is on the unit! I love that you don’t have to turn it on and off, all you do is set the cup on it and it turns on. Also, love the design, it’s so sleek and clean looking, and fits on my small desk very nicely. I confess I didn’t know what the aluminum disk was for at first, but I figured it out and have used it ever since, very thoughtful and makes it useable for any cup, it was a Christmas gift from my sister and she really picked a winner!! Great gift, thanks!