I originally started wearing these socks in 2001! Didn't believe my girlfriend when she said I needed good "wicking" socks for our mountain hiking. I bought a pair... despite the cost (which I thought was ridiculous because I always bought the 'ol sixpack of white tubes). I own 7 pairs of them that I bought between 2001 and 2005. I wear them about 4 days a week on average as I don't wear them on days I work.  NOT ONE pair has worn through (under a guy of 300 lbs!) in all those years! They are all nearly like new, except 2 pair. Sure they are not quite as soft as day 1 but they are in incredible shape, still form fit and perform, and yes wick sweat.  I have two pair that finally are starting to wear out the elastic on the tops.  I also have huge calves.  I believe these socks are well worth the money and are incredibly comfortable.  No other brands that I have bought since even last a couple years and they certainly don't fit as well.
I just received 3 new pair (which are, as I said, the first pairs I have purchased in at least 7 or 8 years.  The fit is the same, they feel the same, and look the same.  Only time will tell if they have "quietly" changed the quality like so many other things these days.  But for the longevity and quality they've given me, they deserved another chance.  I only wish shoes and boots could be made to wear a little better.

An update, 4 months after receiving the socks, they seem to be the same ones I bought several years ago. My Lord they are nice! Keep it up ThorLo.