Purchased this for my husband, and he really enjoys it. Haven't had it long, but it's comfortable. He sometimes wears it up, and sometimes turns it down like a collar.
This is a really nice shirt. The small fits me perfectly (including the sleeve length) - I am 5'5" around 130. The material is midweight, not to thick, not to thin. The construction is nice; all of the seams are straight etc. The only negative is that the mock turtleneck is a little bit higher than I expected, but it still looks good on me so I ordered two more.