Porter Rockwell wrote a review of Marmot Helium Sleeping Bag: 15 Degree Down on September 8, 2011
This kept me warm down to a 25 degree night. It was roomy for my 5'9" frame. The only thing I did not like was how much i rolled and got twisted up. i rolled off my pad several times. I'll be sticking with Big Agnes for this reason. Otherwise a very solid and warm bag. It also packed down very small and the light weight was very good.