I had bought another shirt from doublju and a blazer and so far this one is my favorite item.  The material feels the same as the last shirt which seems good.  I bought a large in all three items and it is the winning size for me.

My stats:

5'5"
170lbs
Athletic/ muscular build
Waist: 32

The shirt fits tight around the arms and is just a tad long but its because I'm short and, not to brag or toot my own horn, but my arms are muscular.  A large would fit some one in the 5'6"-5'8" range better with a slimmer build.  At least those are my thoughts.

Hope this is helpful.