Sean K.wrote a review of The North Face Dark Star Sleeping Bag: -40 Degree Polarguard on February 15, 2007
Used the sleeping bag in -15F camping on Lake Superior North shore. Its rating is for -40, and that would be a much more appropriate temp for this bag. It is incredibly warm... way to warm for -15F.
Also, I felt the bag was a little short for me. I am 6'3" and have the long version, but my toes were still right up to the edge of the bag.