These are the most comfortable socks I've ever worn. Since I have a small, 5.5 size foot, it is wonderful that they come in a size that fits me. Most socks are just too large and have extra material that bunches up around my toes.
I also like that they are cushioned well under the heel and ball of the foot, as well as being supportive under the arch. I wear them all day, even through my workout at the gym, and my feet never get sweaty, uncomfortable, or stinky.
I really did replace all of my other socks. That seems kind of expensive with the economy being so tight right now, but it was worth it to me. My daughter and my son's girlfriend happily took my old socks, so they are being recycled and not just tossed out.
I definitely recommend Smartwool socks and I will be buying more of them in the future.