I've had this bag for about five months and just wanted to sing its praises. I'm not a fan of mummy bags and this strikes the perfect balance between a little extra room, weight and insulation. It packs super small in the included compression sack (although I do think they could have made the sack a little bigger given the fact that it compresses) and comes with an awesome storage bag and special bag for washing.
The coldest I've had it out was only to about the temp. rating and I was MORE than warm. Very surprised given its a 650 fill and has a little extra room in the toe box. The warmest I've had it in was about 65 degrees and being able to open it up like a quilt was awesome. Perfectly comfortable.
The side zipper hasn't snagged on me once but I have found that zipping it back up after it's been turned in to a quilt is a little problematic. Might be me though. When you put the specs against other bags, and can pick it up on sale, it's a no-brainer. Great bag.
This review was written in the old system and had content requirements that are different than reviews written today.