They didn't send me a bowstring with the bow, so while I was waiting for the one they should have sent, I shot the bow with one I had made out of BCY 10 for another bow that happened to be the same size. When the stock string came, which I believe is made out of D97, I found that I liked it better because it seemed slightly quieter than mine, and have used it ever since. I don't plan to replace it until it wears out.
When I do replace it, I will probably call Chad Weaver or some other stringmaker who has experience with a lot more types of string than I do.