As a Merino, it worked perfectly. I was switching between 3 socks (2 of this Columbia, and another lightweight Trekking socks) during a 50 days trek. The Columbia wicked moisture brilliantly, and prevented, or at least minimized blisters, and kept my feet chafe-free.
No less important, it had no smell what so ever, ever after wearing them for 2 weeks continuously.
The only Con, which is a pretty serious one, is that it's not durable enough. While the other sock remained in good shape, the 2 Columbia began to wear out in the heel and Achilles tendon.