I work mostly outside in a rain-saturated town (Ketchikan, AK) and this past summer was one of the wettest on record. I wore this jacket everyday and it did not disappoint!
The shell is very lightweight, and breathable. Easy to move in too! Velcro around the cuffs, and pull cords around the hood and bottom of the jacket did wonders to keep the sideways rain out. Pit zips were a godsend on the few warmer/dryer days we had.
I love this jacket and believe it's worth every penny!
As for sizing: I'm 5'7", 135lbs. usually a S but bought an XS because I wanted the slimmer fit. It still had enough room to wear a Marmot Venus jacket under it.