I'm 6 feet tall, 235 pounds, with bit of a beer belly. The Extra Large fits very well; the fit is relaxed but not baggy, maybe even a bit fitted. Arms are a good length. The main body of the jacket falls about 3" below my belt line - good coverage without being excessively long. It layers nicely over a light sweater or flannel shirt.
The quality is what you would expect from Wool & Prince - very nice. Zippers are great, and the stitching is all perfect. The weave of the material is very tight - it's definitely not a wind breaker, but it stands up to a light breeze.
The only thing I'm not 100% thrilled about is the collar has crease in so it doesn't lay flat. I can probably steam it out to get it to lay flat, but I haven't gotten around to it yet. And it's a little annoying to have to do that on a brand new coat.
I'm finding myself wearing it a lot in our Sacramento "winter", in weather between the mid 30s and mid 50s. Honestly I'm wearing it around the house a lot too, almost like a cardigan sweater. I'm quite happy with the jacket overall.