By David van Erk from Brooklyn, NY on 5/8/2008

Great sleeping bag and I have the 40F as well. I'm 6'5" and the long model fits like a glove with some room to spare at the side for moving arms and legs.
Rolls up much smaller than the previous bag I had (synthetic Ajungilak) and even though I'm a warm sleeper the 20F and 40F are really 20F and 40F. I had the accidental 30 degree nights in the 40F that works well when wearing sweatpants, socks and a thin fleece though. Haven't taken the 20F to its extremes.
Too bad it doesn't come with a pocket for small things like batteries. I always store them with me to keep them from draining in cold temps.
Best thing about it for me: I absolutely love the waterproofed head and foot ends as I'll always hit either side of the tent and start off condensation.
As a side note: I'm kinda curious to how this zips up with the female model (right zipper) as advertized on their site though and whether this works with different lenght models.