I like this guy.
I can twist the fuel cord and flip my canister upside down, and hold it in my lap or sleeping bag to keep the canister warm and getting more fuel squeezed out of the canister of really cold days.
By the way, why not use a pressured liquid system in the cold and in high altitude? I have used my MSR whisper light international in -20 f. with no problems. I have not had it past 10,000 feet though...
Thoughts and reasons?