The first time I used this was with a large glass mug full of tea (holds about 2.5 cups). Worked EXCELLENT, kept everything in good condition. Next time I used this with a very large ceramic mug full of coffee (also 2.5 cups) and it didn't help much but warmed it up a bit. I wasn't sure if the type of liquid mattered (I added much higher viscosity milk to my coffee) so I poured the coffee into a glass mug and it worked perfectly again. I tried it with a standard sized mug (holds about 1 cup) and it worked great, the coffee stayed nice and hot long after I'd forgotten it was there. The instructions state that if the ceramic mug does not heat up, use a smaller mug and that the heater works best with a metal mug. Well, it works great with a glass mug too! Definitely worth $8!
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