Excellent device, a definite keeper

Thermal ability to hold coffee hot is very good. It feels a little bit like plastic, but when you bang lid & body together you know it's glass. This is definitely a keeper - i've been through 6-7 other thermal cups both plastic & ceramic. i'd give it an A-. To move it to an A or A+ for me (these are more my situation than flaws of the device): 1) 1 oz larger capacity 2) 1/4" larger diameter 3) 1/2" lesser height, so it could fit in my microwave without having to take lid off for reheating. I drag my first (and usually only) cup of coffee out for two+ hours, even good thermal cups are going to cool off, and a short stretch of microwave zap bring the temp back up to spec.

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