I love Madelinetosh yarns. The colors are wonderful and it knits up like a dream. The hand-dyed nature of the yarn means that you may have variation from skein to skein, but usually this isn't a big problem.
This is just the latest in my long line of Jitterbug yarns. I have knit many pair of socks, as well as hats and baby things with this yarn. I find it knits up nicely, is a good weight and washes well. My experience with this yarn has always been positive.
I knit the fingerless gloves free pattern from Crystal Palace with this year. It is a very soft yarn, and I'm not sure I would like it for socks, but for these gloves, it is great. The pattern was easy to use and the yarn colors were stunning. Note that one ball makes exactly one pair of gloves, and that they are fraternal rather than identical twins.