I used the sock pattern on the Jimmy Beans mailer to make a pair of socks with the Regia Hand-dye Effect yarn, and they turned out really snazzy. The yarn does have a tendency to puff up when it's worked over more than once, but the pattern made that acceptable.
I hesitated for a few months before buying the Noro Kureyon Sock Yarn because I thought it might be too rough and uncomfortable. But it's great -- the colors are striking, the yarn has thick and thin parts that add texture to the pattern, and the socks are wonderful to wear. Love it!