KP's Swish is really soft and a lovely yarn for the price. I would chose this over any more expensive merinos myself because I love to save a buck. BUT, when you machine wash it, always wash the garment inside out. It has a tendency to fuzz and pill a fair bit, which happens mostly in the wash. So wash it inside out to keep it looking new on the outside. This is a good rule of thumb for ALL machine washable knits, by the way.
Oh, and FYI.. socks knit in a superwash will still felt a little bit on the soles of the feet due to the extraordinary amount of heat, sweat and friction, but it's nothing to be concerned about. If anything, it only makes them form fit to the wearer's feet even better.