I have been buying these in bulk for several years now and they are my primary sock.  I use them for the office as I always have problems with traditional socks falling down throughout the day.  Traditional 'dress' socks are also too thin for my tastes so these work great.  These have good heft but not too much so that dress shoes to sneakers they fit well.
These do not shift and bunch in my shoes and they are consistently manufactured year after year.  The black holds up very well when washing as they do not fade out, which is important since I mix years and batches.  They are very affordable so I can dispose of those that wear out (12 months regular use they will thin) or that the dog finds.
My order of 6 packs once a year has been a great investment and stress reducer.  No matching at laundry, holes in the toe and always have a clean pair!
I recomend pairing with a sale or discount and that will really make the difference! I usually just bonus up the deal to what I would pay at regular price so its like a pack or two free!