They are legit.
I was one of the first people to buy one of these jackets from Nick. Let me tell you, they are quality jackets. I skied mine all season, and it held up great. The fabric is superb, even on a super wet day where all my friends were soaked, I was the only dry one. Besides really kickass waterproofing, the fabric is tough, no real noticeable damage occurred to it from falls on rails or snow. It will keep the pow out: the customizable length helps keep snow out, along with the draw cord at the bottom of the jacket. In my personal opinion, it is one of the best jackets i have ever owned.
One last note: you can make this jacket as unique as you want it. So i say take advantage of that! Fabric color, thread color, zipper color (including dual colored zippers). you can do whatever you want.
hope this helps!
-Dory