Steve "Frank Bullitt" McQueen sent me one to test that he made. WOW. I like it a lot! I haven't shot too many strings to be the best educated as to pros and cons,however I can tell you this: it increased my bow's speed, decreased the hand shock (no twang, even without any silencers) and is built VERY well - which speaks more to Steve's ability than the material per se. Not to mention he's a great guy!
I placed another one on order as soon as I tested the first one (for back-up) and that says more than any words can how I feel about the string. Top Notch.