Pro Product for Less
My Mentor jacket has been with me on top of every major peak I've summitted and every line I've skiied in the past two years. This is a workhorse jacket that will not leave you disappointed...or wet.
Regarding fit, I'm 5'9", 175 with broader shoulders and the medium works great for me. There's enough room for my base, wool midweight and down jacket underneath. The fit is close, but I don't want a big baggy jacket when I'm in the alpine.
Ventilation is great with pit zips that lead all the way down to the bottom of the jacket. All 3 exterior pockets are mesh as well, so opening them will give you added ventilation. Proshell doesn't breath very well (if at all) but it's fine if you vent the coat properly.
Waterproofness has been spot on. No complaints whatsoever.
The jacket is extremely durable. I've put this thing through some major abuse and it just keeps on doing it's thing.
The price on this jacket makes it a no-brainer. Much cheaper than some other companies who use dead birds as a logo, and the same quality. OR also backs their gear with a lifetime warranty. If something goes south with your jacket, call them up and they'll replace it for free, or refund your money, no questions asked (I've been through this process twice and the guys at OR are top notch and very friendly). If you want a quality jacket that will protect you when it's nuking, last for years, and cost less, get the Mentor.