Loops look slightly padded.
String material doesn't affect how a bow draws.
Bow noise comes from several variables including string build, tuning, bow design, silencer placement, arrow tune, arrow weight, etc.
The main benefits, to me, with high performance materials is increased durability, increased stability, increased consistency, decreased stretch/creep.
I'd use them if they were slower. I can't see or shoot a difference of 10 fps. If a few fps was that important to me, I'd choose a different weapon. YMMV