I own both but carry a single-wall with a neoprene wrap (not a full cozy). So long as the thing's not full to the brim the rim will absolutely not burn my lips (Ti heat transmission is very poor, an order of magnitude less than that of aluminum). The double-wall is rather heavier and as noted, cannot be cooked in, in a pinch.

My $0.02

Originally Posted By hatidua
I'm on the verge of buying a titanium mug and am curious if those who have a single-walled version wish they'd bought the double-wall variety? -not due to weight, but heat. If cost wasn't an issue, I'd get the double-wall model but the wife thinks the price tag on even the single wall model is absurd for a small metal cup...
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--Rick