My overtime for the first half of today was canceled so I was able to shoot the Boo 36 strand Excel string with cat whiskers served on. The string shot at 309 FPS compared to a BOO FFF string of 319 FPS. It was alot quieter then the other three strings I have had on the vortex, more like athud and not the normal loud whack sound. At this point not sure if the cat whiskers is what I will need in the future though. I like the way they look. They make the CB alot quieter. Will it make enough difference in a hunting situation? Even if it did, the nice loud click of the CB being recockedwould defeat it. Makes it alot quieter for shooting in the back yard, the neighbor two houses down does not peak his head around garage giving me a funny look. The one hunting situation that I do think may be good is if you shoot a tree rat the entire woods will not hear you. I like the cat whiskers, Don has done a good job with them. I am not a speed freak, at least I don't think so, but not sure if the 10 FPS is worth giving up for them. Also first time I ever was able to hear my arrow that good in flight! LOL!!