I have two of these and they are the bomb. I can use my 1+ season down to about 35 degrees with no cold issues when used with my HG 0 degree full length underquilt.
Great quality at a great price. I scooped up the 1+ and the 3 season the last time they were in stock. In my humble opinion you can't go wrong with these...when you can get them.
I also picked up a 1 season and a 3season when they had a sale, but I got the actual mummy bags not quilts. Very nice quality and true to their ratings. I use them in the hammock with no problems. The zipper down the center makes it easy to leave open and climb in. Then I can pull the hood up over one shoulder as I usually lay slightly on my side. I took the 3 season (20F rating) on my winter trip to Allegheny and it kept me toasty with my 20F Incubator (temps hit 18 and 24 for the 2 nights).