I'm 5'11" and 170lbs. I got the medium and I love the way it looks and fits from the chest down. But the arms are a little tight. It works, but if I wanted to put on my own liner or sweater underneath, it wouldn't be comfortable. Maybe only enough room for a thermal and/or long sleeve t-shirt. So far I've worn it twice and it's been about zero degrees outside and breezy. It was obvious this jacket is not meant for that kind of weather, but I wore it anyways. At first I had a t-shirt on underneath and my arms froze quickly. Second time I put on a long sleeve underneath and was much more comfortable.
My last jacket had terrible pockets so I'm thrilled to have a jacket with nice pockets. The hood actually fits too. I have a large head so it's rare a hood fits comfortably. Since the jacket is long, the bottom-up zipper comes in handy. The zipper itself is also high quality. No hangups yet.
I'm very critical and don't like to give anything a 10 of 10, but this jacket is fantastic and gets a well deserved 8.5 so far. It's still brand new, but it looks like it's built solid and will hold up well over time.
One last note. The pictures online make the black wool look like a dark green canvas color. The black wool looks BLACK in person. The pictures are deceiving.