Pummel wrote a review of Western Mountaineering Bison Gore WS Sleeping Bag: - 40 Degree Down on December 31, 2010
Sorry, I did not buy it here but... This thing is amazing. 13 days on Aconcagua...never could zip it up. And summit day was bone chilling cold with can't stand up kinda wind. It lofts so much it fills a tent..but hey, whatdya want. The only complaint is the bulk. Really hard to zip into the base of a large backpack. But the point of this bag is to keep you alive and comfortable. If it doesn't do that nothing will. Lots of money but never regretted it.