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I own one but at no point is it ever more convenient for me to make a coffee and carry it with me in said cup as i will have drunk it by the time I get to the end of my road and then i'm stuck carrying an empty cup for the rest of the day.
If i'm in a rush I can just neck the coffee in a couple of seconds before I step out of the door.
they seem to only make real sense if you're the kind of wrong'un who asks for their drink extra-hot so you can sip at a big cup of burnt milk for the next hour.
Own up. Who owns one of those "I make my special coffee at home and put it in a special mobile coffee mug and drink it on a packed train because I'm a special cunt" special mobile coffee mugs?