I've only used invisible thread once, in the ditch on a multicolor quilt top that I couldn't select a quilting thread color for. It worked great. I bought it based on advice from folks on this board: Superior Threads very fine, reduced sheen, "Mono.Poly" I used it with a polyester thread in the bobbin, also from Superior Threads 60 wt. "The Bottom Line". I ordered them on-line from Superior threads. I was nervous about using the invisible thread but it was wonderful.