I've bought a lot from them and had no problems or complaints!
I love robots and they had their robot-themed fabric on clearance, I bought 30 charm packs at a buck each to make myself a quilt. SOME day I'll be done with all these other quilts for other people and will actually put it together! The quality is perhaps not top-of-the-line, but it's definitely "good" - it's not see-thru, doesn't ravel any more than anything else, etc. I've also been pleased with their solids and the mirage line. Their batiks seem "thin" compared to other batiks but that's kind of a good thing since I blend batiks with prints and solids when I use them.
Their thread is linty (about the same as C&C, as someone else noted) but good and you can't beat that price. My Janome 6600 likes it just fine. I use Aurifil for piecing and CT thread for quilting. Next time they have a thread sale I'm going to buy a whole rainbow! I just wish they had variegated thread, then I'd be in hog heaven!