I don't usually have a lot of problems with C&C, but definitely more than with Gutterman. I prefer the Gutterman for quilting because it's not as..."linty", just using up my C&C on piecing at the moment. :)
I recently bought some thread from Connecting Threads with my fabric order. I haven't had a chance to give it a spin on my machine yet, but I hear good things. :)