Just picked up one of these a few weeks ago. I've used it during "snowvember" at Alta and for backcountry skiing. It's breathes well and is very comfortable. I'm 6'1" 185 lbs. and the large fits great, with a little room for layering. If you spend a lot of time at the gym or have naturally occurring large biceps, the fit might be a little too tight for you in the upper arm / shoulder region.
As for other reviews about its waterproofness and warmth, if you want something really warm, buy a down jacket. If you want something 100% waterproof, buy a hardshell with taped seems. If you want a comfortable softshell that breathes well, then go for the Vertical.