RAB's new Proflex material feels wonderful, and if it is as waterproof and breathable as RAB says it is (and I have no reason not to believe them) this would have made a wonderful jacket. The only problem is the ultra-slim cut limits it to the point where I can only wear a T-shirt under it before it pulls way too much across my torso. If I get a larger size the length and sleeves would be much too long. I'm 5'8", 155lbs with a 32" waist - certainly not a hefty guy. Yet a medium (which they recommend on their sizing chart) felt really constricting. So beware of this fact - if that's the cut you're looking for you might love it. If not, like me, you won't be pleased.
This review was written in the old system and had content requirements that are different than reviews written today.