Looked around at several down jackets and found this on sale at OMC! What a bargain! At first I wasn't sure I was going to keep it. I put it on as soon as it arrived and I expected to heat up right away while in the house. I didn't notice much difference and was worried it wasn't going to be warm enough. First cold spell, took it out and boom, this thing was perfect in 29 degree weather with just a T-shirt underneath. I wore it while running errands, in and out of the car, in to the grocery, etc. Perfect-not too hot, not too cold. Next, I took it on a trail run to the Grand Canyon. 28 degrees on the rim and I was not cold at all with a long-sleeve Patagonia Silkweight shirt underneath. Stuffed it into my Osprey Talon 11before dropping in and ran down the Canyon. This jacket weighs next to nothing. 6 hours later when I came out and the sun was going down, I popped on the jacket and warmed right up. Fit is a little strange. I'm 5'11, 168 pounds with not overly broad shoulders but not a skinny weakling either. I generally fall between a medium and large in most brands, although always medium in the more generous cut North Face stuff. The medium is a little tight around the upper back and it's a little long dropping past my waist on some of my size medium shells. For comparison, the medium Arcteryx Thorium AR was a perfect fit while the more fitted Cerium LT in the same size was a little tight on me. This fit in between and I wanted the lighter package/higher rated down, but you couldn't go wrong with Arc stuff. I wanted it to fit close though so I stuck with it rather than size up. I can still get the medium over my Mountain Hardwear Zonal vest-thin polarguard but like I said, it's tight across the upperback / shoulders. Arm length is perfect-34/35 sleeve. If you wanted this to fit over a thicker fleece, you may want to consider sizing up. When you start spending this kind of money I want it to fill many uses. I will use this to bomb around town this winter instead of a fleece (it blocks more wind-not totally but better than fleece an not lint/dog hair), I will throw it on over my running clothes when I need to warm up and I will not hesitate to stuff it in my pack for insulation because it only weighs 8 ounces! I read a lot of reviews before taking the plunge. I hope this helps.