The phantom is everything I wanted and more in a 0 degree bag. It is ultra light, buttery soft, and very breathable. I am a mouth breather and often I sleep completely inside my sleeping bag which means I'm breathing out large quantities of condensation all night long. I always stay dry. The condensation DOES collect on the outside of the sleeping bag, but never on the inside. I think the bag is true to its temperature rating. Also, I have had no troubles with the zipper as of yet. My 2 last sleeping bags (not a Mountain Hardwear) had wonky zippers and they were always giving me trouble/getting jammed. Not the case with the Phantom and I've had it for over a year now.