'Spaw's right. I recently took the plunge on 2 of my guitars. Had the nuts, saddles and bridgepins all replaced with f.w.i. I have zero regrets. They sound and play better than before when they had comparable bone equivalents. Not a cheap process, and I had a luthier very accustomed to working with this material, do all of the cutting, polishing, bevelling, compensation of the saddles, and the setups.
If you interested, you can see a few photos of the work. (These are all "after" shots.)