This jacket is absolutely great. I am 5'5" and the small fits perfectly. I would equate the actual benefits of this piece to what the Patagonia site advertises--a heavy, no-frills jacket whose sole purpose is to provide crazy warmth. The jacket is wind-proof, water-resistant with its dwr, and just downright toasty. I have taken it out in -20 wind chills and it does not disappoint. The "DAS" stands for dead air space--the most effective insulator. No heat escapes this thing and no cold enters. Feature and fit wise, the jacket is great. It does have a slimmer fit and looks good, if you're into that sort of thing. The elastic cuffs on the sleeves effectively trap heat inside and negate the dreaded cold wrist syndrome. What's more, the zipper pockets' length matches the diameter of the sleeves. This creates a good (albeit not great) block when you need to warm your paws. PS: The actual jacket isn't as shiny as the photos depict. It looks much better in person.
"I layer this parka over my R1 hoody and micro puff, and am still comfortable moving at -40 degrees"
My wife and I each got a Das Parka two winters ago, with plans to take them on our Denali trip. We moved to interior Alaska two winters ago, and have had many opportunities to wear them. For snowshoeing, it's PERFECT. It stuffs as small as my Micro Puffy jacket, and keeps me plenty warm during the breaks, even at forty below! It's definitely not a stand-alone parka, but a great final addition to the layering system.At high camp on Denali, we waited for three days at minus 25 degrees F with 25 - 35 mph winds, before we got a summit day. This parka kept me plenty warm while maintaining and improving our snow walls, and during trips to the "outhouse"