I've also purchased from them, and I adore their fabric. I've done the pre-washing, and non pre-washing before I've made quilts, and I have to say that what I received (from their Cheep Talk) line did not ravel at all and I only had to trim a tiny bit to square up my edges.
I've paid $10 and over at my LQS, and lost over 1" with prewashing.
For my money I love Connecting Threads. I think their fabric is wonderful, it's a good quality, one of the best I've gotten for the price.