I've had the same Ti mug for 15 years now I think, does not stay hot or cold and I don't care - it's small, weightless and indestructible, I drink my coffee while it's hot, and since it's all metal and not insulated I can just put it on the low flame or next to the fire for a keep hot or reheat.
Works great as a tiny pot for the same reasons - melt butter, heat cream for cappuccino whip-ups, make tea right in it, etc...