I have a custom one of a kind non ff and although I am positive it would handle ff, I do not shoot ff on it, shoots just fine with B50. I have another one of his Africa series that is macassar ebony in the riser and limbs with buff horn tips, it has ff on it, came that way and was made for ff. Had an exoctic riser with ff limbs I got from Beth, shot it with ff and it was abit rough,ie, hand shock, switched to B50 and tamed it right down. For my B50 ones I use 14 strand strings, do not like the 16 strand ones that come with the bows, a bit too big for me. I honestly cannot tell a difference in speed from my ff and non ff models, both kill just fine. My new one will be non ff and it will not get ff on it because I will not take the chance of ruining the warranty, but a modern string with properly padded loops should not hurt as Felix has proven. Each person must do what they believe is right, your bow, you can do what you want with it.