I bought tuffstrand, 52 feet (15.8 m) on sale and used it on my Ringmaster Jr. with OS 15FPS. It seems to be okay. I'm not into competition, so can't give pros, cons. AMA safety rules allow it for demos and practice, but not during competition. Appreciate the comment from mikeainia on fishing line. That might be worthwhile for me to try for sport flying.