I don't know, personally I would absolutely hate having to remember to keep my mug charged - although it's a damn cool product, just not for me. I'm not sure I

I don't know, personally I would absolutely hate having to remember to keep my mug charged - although it's a damn cool product, just not for me. I'm not sure I can agree about a phase-change solution being overengineered, however; while the materials would be more complex, the design itself should be far simpler than an electronic mug, and exactly the same as a vacuum sealed one.