I shoot all recurves and several years ago,I put a B50 string on the first FF bow that I bought,assuming it would be quieter.Later,I bought a used bow that had a FF string.It was so quiet and vibration free,I tried one on the other bow.The FF string made it quieter and it had less vibration.I haven't put the FF on a bow yet that it hasn't reduced noise and improved handling and there have been quite a few.I know all bows are different but that's been my experience with quite a few.