Crandall also cited comments by leading stringer John Gugel, who he quotes as saying, "To get the benefit of poly you have to hit the ball really hard. That's when the string bed becomes non-linear and much stiffer. You can see it with professional players. They hit the ball just about as hard as they can every single time. And there are unintended consequences to that."
Gugel said he, too, finds that players are increasingly looking for alternatives, and that they are very pleased with the performance of MonoGut ZX. "Most of the players that I introduce MZX to are a little bit skeptical of what it can do. However, after hitting with it, it is the consistency of string bed stiffness that they like. They find the spin as good as polyester and some find it better."
Gugel said he actively discourages junior players from using polyester and that he has "a lot of juniors using 100% MZX and playing at a very high level." Hybrid stringing is also a popular alternative, he added, with one of the best combinations being natural gut in the mains and MZX Pro in the cross strings.