"I bought this at LL Malaysia because, well, just because I needed an Awesome Minifig Mug!
I noticed the small dimensions of the cup at the time, so I knew to expect a smaller cuppa, but the real disappointment for me is that it won't hold the heat in for long at all. To enjoy a hot cuppa, you need to down it quite quickly, otherwise not even Luke will keep it warm :).
Granted that as this is primarily designed as a children's cup and I feel that LEGO would not want it to hold water at boiling temperature "ad infinitum", so the design is quite sound. The issue is mine, not the cups. Maybe a "Grown Up" version in the same styling could be sold as well? I know that I would buy an insulated Upscaled Minifig Mug - Maybe upscale it a bit more too!' Heck, I'd buy two. One for home and one for work.
Thanks LEGO. You are keeping this aging dude young."