I have been playing around with different ropes trying to find one that I like for wrenching. I have used tachyon most but wasnt happy with how the ascenders tended to pick the rope easily when going up. I then tried a piece of KMIII, and found that the more I used it the stiffer the rope became, which I didnt understand. But the Ascenders didnt pick the rope. I then had a chance to try Fly. So far I have been really happy with the feel, size and consistancy of this rope. I have been putting a 110 foot piece through the ringer and it is just as soft as when i started.
I know some people hated it and some people liked it with double line, and the splice isnt exactly very friendly to complete. It works well with my single line system, and I dont use a splice when using the rope wrench. Im pretty sure I will be ordering a 200' with my next gear order.
I did find out early that coiling fly wasnt a very good way to put the rope away, because it hockled pretty bad the next time I used it. But a rope bag solved that.