Absolutely amazing- incredibly comfortable and warm, I never want to take it off! I have a super high body temp, so I generally don't like to layer up a lot when on the mountain, but this is the perfect layer...
I am 5'2, 115 lbs, and have the Small, and wouldn't want to go down a size. The legs are very form fitting, and then the torso is a bit looser. The hood and the thumbholes are AWESOME, and I love the purple! Plus, the 'rear zip hatch' is great, I can't stand undressing all the way just for a quick pee break.
Overall, a super great find, would recommend it to anyone who likes to be warm, comfortable, and a ninja!