Great as a summer bag.
Used this on the Appalachian Trail in 2012 as my summer bag. Had it sent to me in Damascus, VA and changed back to my North Face Blue Kazoo 15 degree in Hanover, NH just before starting the Granite State! Nice and light for backpacking and held up well for 3 months. There were some nights in PA, NJ, NY and CT where it was too warm to sleep inside, so slept on top in my liner, but was glad to have it as even in the summer months we got a few thunderstorms that left me drenched and it was great to climb inside to warm up. A few nights it did dip down low enough to actually climb inside in the middle of the night. Great summer bag and nice and light. I'm 5'9" and have broad shoulders and the regular was perfect. Also, I have the prior model, but I think the only thing that has changed is the print scheme on the outside (mine is all yellow).