Update: Discovered hole the size of a quarter on the heel so the pilling mentioned below reflects rapid wear. Completely unacceptable considering they're less than 4 months old. Too bad - really liked the style and feel of the socks.
-----
I've only had these for a few weeks but very comfortable so far. I like the gray color combo, they rise above my running shoes just enough, well padded (if you prefer extra cushioning) and they have kept my feet dry. The only caveats are that these socks are quite a bit thicker and more cottony than other hard-core running socks (I generally wear both Wigwam's Ultimax and Ironman - excellent and thin throughout) so they fill your shoes out more and seem to be warmer/less breathable. Not a problem in winter but we'll see how they breathe when summer is here. Also they pill a bit on the padded areas in the heel and toe - not sure if this is related to durability issues noted by other reviewers but certainly don't feel cheap. Overall very pleased so far.