Between these and the SmartWool PhDs I've come to the strong conclusion that merino wool is the ultimate cycling sock material. These are pretty darn thin and I'd imagine will be my go to sock on really hot days where the SmartWool is a little too thick. I've tried a few different relatively high dollar synthetic cycling socks and none of them seem to keep my feet as dry and comfortable as merino ones do.
They worked pretty good as a liner under the PhDs for rides sub 20F, but I would probably want something more substantial to wear alone w/ vented shoes and no booties below 50F or so.
No bulky seams, good ventilation and wicking, and they seem to be holding up pretty well so far, I have only had them for ~5 months though.