I piece with a variety of threads--but prefer Coats and Clark for sewing down the binding on the back by hand--never tangles or shreds for me. On the long arm, I prefer SoFine #50 (so does my Gammill!) but use YLI and King Tut, Permacore, Omni,Glide and Magnifico. I seem to have to make more tension adjustments with the Glide& Magnifico.