I should start by saying I hate the term "puffer" when referring to this coat. The truth is because of the 800 fill down, you will not look like the Michelin man while wearing the Fitz Roy Hooded Down. The higher the fill count the better quality down being used in said coat, which translates into less bulk in your jacket.Because you are opting for such quality down, you also benefit from being super warm with such little weight on your body. This coat is 20.9 oz. You'll barely notice you are wearing it while it is keeping you toasty. I gave a strong look at the Patagonia Hooded Down Sweater, but ultimately opted for this coat because I knew it would be warmer, and that is something v.important to me. I also took a strong look at the Marmot Ama Dablam. That is a worthy competitor that is cheaper and only slightly less warm at 18 oz.
With respects to detail, I absolutely love the hood on this coat. Fully insulated and feels great on, giving little to no room for cold air to seep in. With the zipper pulled all the way up, your mouth will be nicely covered from the cold. Coat also has drawcord hem and elastic allowing you to block out cold that would in sneak in through from the bottom. Nice interior pocket for my Iphone/Ipod at the chest level.In terms of temps, I wore this coat this morning in 30 degree fahrenheit weather with a 8 mph wind and didn't feel a thing (with a long sleeve shirt & t shirt underneath). This coat is also windproof so you are very protected. The only thing to watch out for is water. Coat is water resistant, not water proof. I spoke to a Patagonia rep before making my purchase and they explained that waterproof means it is going to stay dry in a wet snow or rain, water resistant means that you have about an hour in a wet snow/rain before it starts soaking through the jacket. Something to keep in mind if you are going to be in the rain/falling snow for a long period of time.
The back of the coat is a few inches longer than the front. Very cool detail so the coverage extends to potentially cover your whole backside. I'm going to invest in a waterproof parka after Christmas to wear during those REALLY cold and wet days in Boston between Jan - March. In the meantime, this coat will be perfect until the serious frigid air/wind makes its appearance.The only thing downside to this coat is its price. If you really can't afford it, take a good look at the Marmot's Ama Dablam. Otherwise consider the Fitz Roy Hooded Down Jacket a very worthy investment.