Great stove, although haven't tested in subfreezing weather - Soto Fusion Trek Stove

Great stove! Worth the extra few bucks and grams over typical butane stoves. Folds pretty small, very stable for cooking with minimal tendency to tip and spill. Good simmer and good wind-resistance, although you should have a wind deflector for high wind, as with any stove that doesn't actually lock the burner onto the bottom of the pot.

Can't be used with the butane cartridge upside down, so at really low temperatures (not sure how low) this will start to limit the performance.