Jon Webb wrote an answer about Mountain Hardwear Phantom Sleeping Bag: 0 Degree Down on August 11, 2014
Hi Luke and Bill,
The only other difference I would add is that the Phantom 0 utilizes 800-fill QShield Down which is Mountain Hardwear's hydrophobic down. This treatment also helps to make the down longer lasting and slightly more lofty (it repels even itself!) Western makes a beautiful bag... we do to! You've got a hard choice in front of you. Good luck!