5'7 1/2", 134 lbs, ordered a size Medium. I returned the jacket.
It's a good quality shell but I wouldn't wear it snowboarding. I think it would make a good hiking jacket but that's not what it's advertised to be.
Issues:
1.) Too short. The jacket is not long enough. Even with a bib (versus snowboarding pants) I would not wear such a short jacket on the mountain. Maybe for groomers on a day with zero powder but otherwise, no.
2.) More slim fit than regular fit, so it feels cramped with more than just a lightweight layer underneath.
3.) There's no media pocket. If you don't have bluetooth helmet speakers then you'll need to buy some.

Like the rest of Arc'teryx's line, this thing is great. Got it for my wife as a gift and she's a big fan. Comfortable, durable, and keeps her warm and dry.

Arc'teryx figured it out when designing this jacket for backcountry skiing, snowshoeing, splitboarding, and for a multitude of other uses as a bonus (I RESORT SKI with this as well). The articulation is there (lifting and reaching with my arms is comfortable, non-binding and the jacket stays put--even with my more athletic shoulder size); Gore-tex pro fabric will guarantee you stay dry and still have some breathability, underarm venting helps when exerting, and little hidden tricks like the sleeve that flares slightly to fall neatly over the gloves (simplicity with a purpose...)
Since I believe in BUILDING my wardrobe from hear to year--and don't plan to wear it and toss it after a single season, cost is worth the price when you consider how many years you'll be using it and NOT paying to replace it. LOVE IT (beautiful colors too!)

Bought for friend she raves about it. Her feedback: Falls about mid-hip and she loves the slim fit; still roomy enough for a mid layer, works great with the Arc'teryx Atom jacket. Super high quality to wear for multi activities.