I purchased this bag last week. It's my second lafuma bag, and I really love their products. I used this bag in my bedroom last night with the window open and slept quite comfortably, although it was probably only 40 degrees or so. I had the hood cinched around my face. It has very comfortable soft material (tactel) inside and though it is narrow along the legs, seems adequate in the chest and arm region. The hood is nice too with tons of down around the head region. The draft guard for the zipper seems a like it might not cover the zipper very well and might be a cold spot once I try it out in 20 and 30 degree temps. It also has a small opening at the bottom of the zipper that I expect will let drafts in if I use it under a tarp without a bivy. It does puff up to have tons of loft (especially around the chest) and packs really small. It has considerably more loft in the chest than my friends Western Mountaineering 20 degree ultralight. It does not however pack to 12x6in like the specs say. Its more like 16x8in and 14x8in if you cinch the compression sack down. Can't complain about the weight if it actually is good to 15 degrees. 2 pounds 2 ounces is pretty light for a winter bag. I haven't used it outside yet. I plan on trying it out the next cold night and if it doesn't out-perform my synthetic 15 degree bag I'm going to return it because of the larger than advertised stuff size. I would give it five stars because it's a well made product, but it loses one star for the larger than expected packed size and another star for the lack of zipper draft protection. Also it's a little pricey to have any issues like that.