First off, Gore-tex pro shell is the best you can get, som preformance isn't a factor.

The fit is really the only thing that should be considered. I picked last years model up from tramdock and the fit is amazing. I am 6'2" 210 lbs, athletic build. So sizing is tough for me, sometimes a L is tiny but an XL is huge.

Because this is designed for skiing/snowboarding the fit is little baggier. I got the L and its perfect. Plenty of room in the chest and arms for layering (which is a must because this is only a shell) and still a slim athletic fit. I would suggest sizing down on this jacket.

I am very pleased.

I bought this jacket last year to replace a heavier North Face jacket that I have. (Alpine Light GTX) That jacket was/is still great but i had a few problems with it. zipper pulled out my beard hairs, and liner got real damp and didn't get rid of that much moisture. So not I no longer have those problems, the light weight gore-tex pro helps shed excess moisture very fast and the off center zipper keeps my beard from getting caught in the zipper.
I am aware of the high cost of this jacket and I can say that it was well worth it! The fit is great, enough room that even a big guy like me can layer underneath and not feel constrained. It is very well constructed and is at home on the springtime soggy hills of Wisconsin as it is blowing through 3 feet of pow out in Alta (nice built in powder skirt kept icy chunks of slush out of my butt crack in Wisco, and fluffy pow out of the smae place) It feels light but it will keep you toasty with just a fleece under it in most conditions. Bottom line...you need this jacket if you don't have one !!!

I know this is not going make Arc'Teryx fan's happy, but I have been wearing Burton shells for snowboarding for the last 10 years, none of them were as expensive as this jacket. The last 2 were gore-tex shells. This Arc'teryx shell makes no sense, I am 5'10", 190 lbs, athletic build, and have a 44 inch chest. The sizing chart says large is for a 43 inch chest, well I laid the jacket down flat and measured across the chest and it is 27.5 inches, multiply that by 2 and you have a 55 inch chest (My Burton Jackets, which people tend to say are baggy, in a Large, measure in at 50 inches, plenty of room for layering). No matter how much layering I do I would never fill this thing up and I live in Fairbanks, AK only 100 miles north of Denali. The sleeves at the bicep are 20inch in diameter, you can see in the picture posted by gwoodward896726 above, the fit is junk, it is bellowing out everywhere, I didn't see that photo until after I received the jacket. The hood is useless unless you are wearing a helmet, looks incredibly tacky while stuffed away and pushes on the back of your neck. The power skirt has no pant interface at all. The Jacket is stiff through out, the sidewinder zipper setup, kind of a neat idea, until you zip it a quarter of the way down and you have a massive flap hanging out in front of you. On top of all of this the powder skirt was frayed when it showed up, and there was a small stain on the inside of the jacket. Maybe I am missing something, but for 500 bucks it's going back. (Actually what makes this even worse is I picked this jacket up on tramdock.com for $235 and it is still going back).

Backcountry.com on the other hand is amazing.

I've got to agree w/ Brice on this one. I just could not get the thing to fit right. It is big, which is not an Arcteryx trademark for sure. Even w/ a base layer, mid layer, and puffy down, this jacket was still sloppy. There's nothing I hate more than while flying down the hill and your jacket is flapping in wind. Don't get me wrong, I don't want it tight but I want to be able to fill it up if I want. I just couldn't fill this jacket up. Ended up selling on ebay at the end of the season...