I admit that I have sensitive feet, and a poorly fitting sock is extremely noticeable and irritating to me. I typically buy very tight fitting socks that have arch support and really hug my foot. This is my first time trying Darn Tough socks and I got 3 different styles. This is the only pair I've worn so far, and it is the strangest toe box I have ever seen. Instead of being round, it is half a hexagon with two very pointed corners that sit right under your toes. It feels like a wrinkle that rubs under your toes and is inconsistent with the tightness of the rest of the sock. I've worn them twice so far and I just can't ignore the toes. They also make my feet sweat more than cheapo socks even though they are lightweight, but that isn't as bothersome to me. The heels also have these corners too, but they stretch around my foot more and are not noticeable then. Hopefully as I wear them a few more times they will conform more to my foot shape, but I don't have real high hopes.
The pair of "Darn Tough No Show Tab Ultra Light" I bought also have the hexagon shape with the pointed corners. The pair of "Darn Tough No Show Tab Ultra-Light Cushion" has a normal round toe without the corners, so I have more hope for those ones.
UPDATE: After wearing multiple days per wash and washing a few times they are less bothersome. I also marked them so that I continue to wear them on the same feet so they break in more specifically. I'm updating from 2 stars to 3 for now. I think they will continue to get better as I wear them. The light cushion ones are definitely preferred to these ones so far though. I'll probably buy more of those ones next time.