I bought the Iceman to replace a Marmot down jacket I purchased almost a decade ago. I can't speak to the warmth of the jacket since it's the middle of July, but it has every other feature that the Marmot was missing and then some.
#1 Pit-zips; having a warm jacket is great, but if you can't adjust for overheating you're going to sweat=get wet=gonna have a bad time. Pit zips are also two-directional so you can vent just the body or just the arms, depending on what's needed.
#2 Cut longer than my old Marmot and has a powder skirt. The old Marmot had no powder skirt and was cut shorter making it very drafty, especially when arms are raised. The Iceman allows for all kinds of athletic movement without creating a gap at the waist=no drafts= no snow up the back when tomahawking. Powder skirt is also removable for less active pursuits.
#3 Attached Hood; I never liked detachable hoods. They typically create extra bulk around the collar area, and if you detach to avoid this problem there's a good chance the hood will still be in your gear closet when you really need it. Some hooded jackets I've owned didn't provide much neck protection when the hood is down, but the Iceman's collar stands high enough to offer ample protection even when the hood is down. I can't wait to deploy the down insulated hood for chairlift rides when the wind's howling and temps drop into the single digits!
#4 Low bulk styling; Having down insulation shouldn't require resembling the Michelin Man. The Iceman's outer shell is smooth so you won't even know it's a 700 fill down jacket until you look at the inside baffles. I also like that Flylow used dark grey material for the underside of the purple jacket. I don't want to have to worry about stains showing up on the inside of my jacket any more than I do about the outside.
#5 Waterproof shell; There shouldn't be an assumption that just because it's wicked cold that you won't encounter moisture. Snow guns that are blowing water at 10 degrees are a classic example. My old Marmot used Membrain rated at 5,000 waterproofness, which is better than nothing in a down jacket. The Iceman rating is 10,000=more better. Add waterproof zippers and pit zips and I think all the bases are covered.
Final note on fit and more features with Flylow; I'm 5'7", 165lbs, 34" waist, 31" inseam, 41" chest. Flylow's chart would probably put me at a medium which is pretty much spot-on, however, I like a little more relaxed fit so I upsize to large in both pants and jackets. Both the Stash Cargos and Especial pants I own from Flylow have adjustable snap closures on the cuffs plus some burly Velcro, so I can keep them from getting shredded dragging in the snow. The jackets have Velcro adjustable cuffs so I can keep them out of my soup at lunchtime, and the longer sleeves cover almost my entire hand, preventing frostbite when holding a cold one bare-handed in the parking lot après ski. Both pants also have adjustable waists and big belt loops so no worries about plumber butt, unless that's the look you're going for.
Nice job once again from Dan & Co.!