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Title: Fair at best
Review: I agree with the others. You have to use a flat bottom mug. I looked through my large collection, and they all have a small lip on the bottom. This is the only part of the mug touching the hot plate, and that tiny amount of surface will not keep the beverage hot, unless the cup is nearly empty. My old one worked all day, everyday, for 14 years. I never paid attention to the manufacturer. Too bad. Now I still have to go to the microwave every few minutes to heat my drink. I wish I could find out what kind of cup the 4 and 5 star reviewers have.
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