Dynaflight '97 is my favorite string material, but not because of any big speed gains. I like it because it's much more durable, has a lot less stretch and creep, and reduces handshock in a bow. Whether it's worth using on your bow....you will have to decide that.

B-75 from Brownell and it's BCY counterpart, PENN 66, were taken off the market a few years ago. The reason is they broke without warning, usually at the nocking point. They would not hold up to constant flexing, kind of like a wire. They also had very low abrasion reisitance. They did offer a tiny speed increase over regular dacron, and less stretch, but were very lacking in durability. I would not put either of them on one of my bows.

Chad