Ryan Swank wrote a review of Mammut Alyeska Jacket - Men's on January 26, 2012
I was very excited to try this jacket on and get based on researching different jackets. I had considered the Arcteryx Stingray and Theta, Mountain Hardwear Snowtastic/pocolypse as well as a few others.
I also thought it would be cool (albeit obnoxious) to wear this for warming up at Alyeska before a heli trip in AK.
First of all, the craftmanship of the Alyeska is superb, the attention to detail is incredible. Pockets where you need them, great zippers and the ability to connect to Mammut pants is a nice touch. The sleeve 'gaiters' are awesome and should be standard on ski shells. While I wouldn't call this an insulated jacket, it does have a nice layer of fleece that is a bit more substantial than the Arcteryx Stingray.
The jacket also looks great which while taking a back seat to fit, performance and features is still important when considering shelling out this kind of cash. I really like the constrasting colors of the zippers.
One negative is I'm not too hot on the partial zipper. I get the concept that it supposedly allows better flexibility with a helmet but 99% of the time I won't be wearing one and it seemed a bit of a gimmick. Didn't try it with one though so can't say.
The reason I ultimately didn't end up getting this is the fit wasn't right for me.
I'm 5' 11" 180lbs and always find trouble finding gear that has long enough sleeves, is not too tight in the shoulders and is not overly bulky and "poofy" across the chest. The Alagna in a Medium fit very nice so was hoping the Alyeska would be similar. Unfortunately not, the Alyeska was way too tight across the shoulders and under the armpits whilst the Large felt great but was way too bulky across the chest - even with a Patagonia down sweater on.
I ended up getting the Stingray in Medium and really am happy. It's 80% of the jacket for $200 less and the fit is incredible.