I bought this bag because I wanted a synthetic bag to fill in a gap between my down bags (45 degree and 20 degree). I liked this one because of the ability to put both your arms out while remaining in the bag. I've used this in combination with a BA insulated air core pad and the BA clearview pad. I'm just under 6'1" and around 175 and purchased the long.

While I usually prefer down bags, I am fairly please with this synthetic one. The insulation stays evenly distributed, and the welded seams are a BIG plus. Between these two features, I didn't find any cold spots, which was a big plus. The arm zips also work really well. I was able to stay inside my bag and work in my tent, organizing gear, cooking food, or reading a book at night. The only caveat being that normally I can squeeze into normal sized sleeping bags even though I'm just under 6'1" (I have the MH phantom 45 in regular and fit fine), but with this bag, I needed the long in order to sit up and use the arm holes. The draft tubes along the zippers work well, and the hood seals up nicely around the face.

As far as the temperature rating, I find this bag is good down to the lower 40's and maybe upper 30's, depending on what you wear. I just got back from two nights out on the Delaware Water Gap, the first night hit a low of the upper 30's, the second, the low 40's. Both nights I wore microweight smartwool baselayers and smartwool socks, and used the BA insulated air core pad. The first night I got chilled, slipped into my softshell jacket and threw on my wool beanie, but was cool until crawling out in the morning. The next night, I started with the jacket and beanie on, and filled a water bottle with hot water and kept it by my legs or at my stomach. I was very comfortable this night, and probably could have skipped the water bottle.

My only beef with the bag comes as a result of the dual zipper design. There are two separate cords that are needed to seal the bag's hood, and when drawn in really tight, leaves quite a bit of excess cord that can become annoying. Not a deal breaker, but something to consider.

My favorite fall/spring bag. This thing is super light and it stuffs like no other. I am a really hot sleeper so it works for most of the year for me, but when it drops down into the teens this is not enough but thats why its a 32 degree bag.