I enjoy using the new poly-filament. My Pfaff Exp 3.0 has no problems, nor does my Brother. Only use it in the top thread. I set my tension a bit lower - 4.5 instead of 5 and use my usual 70/10 Schmetz mictrotex needle. Perhaps problems are avoided because I have a "straight-stitch" (small hole) plate, but I didn't have it before and no problems then either. Only thing I don't like - this poly thread is supposed to be a matte finish, but it is still shiny. Otherwise all is well.