The socks are the best I've worn. I own 'em from everybody, but the fit and comfort from Point 6 is really top notch. The socks haven't been out long enough to determine real-world life expectancy, but I got some early pairs and have been wearing them regularly. Truly love the fit of the socks.
They're made w/a compact spun merino, which should give a more durable sock than Smartwool.
Fit truly great. I like the "Active" line.
Smartwool, Teko, Darn Tough, whatever else... I grab my Point 6 socks first.