I used it to stitch in the ditch a quilt that I just finished. I used it in the top and in the bobbin. It did break several times and was hard to handle, but it was worth it because it did not show up on multicolor fabrics--it blended with EVERYTHING. My understanding is that nylon melts at a much lower temperature than the other kind (polyester monofiliment) and that if you have a choice the polyester thread is the one to get. Before I began I did a lot of test stitching and did lower the upper tension a bit. Also, sew slowly and just accept that you will probably have a few times when your thread breaks.