If your used to using Aurifil you should notice quite a big difference. At least I do. I'm not talking about lint, although CT thread is some of the lintiest I've ever used. But the quality of Aurifil can't be beat and CT thread seems much heavier, thicker and has blobs and bumps. I use it in my vintage machines, but I don't use it in my fancy Bernina. My Bernina is in the hospital enough. I don't need to add to it's issues with lower quality thread.