I had read some reviews before ordering, which dealt with the size of the shirt. I, too, will have to confirm dasss shirt smallish fails (I had already ordered L for security instead of M).
In my person (relative narrow stature 185cm, 85 kilos, slender) sits the shirt very good. Also at the shoulders, the shirt is not too wide or too narrow.
Qualitatively, I can at this point also detect any defects. The seams are well and the shirt are a very good tactile impression.
All in all, I can make a recommendation for this product after my first order. I will order still further shirts for my opinion about these manufacturers to solidify.