I always use multifiliment strings and plan to stay with it for several reasons. What happens if I receive a demo strung with polyester? Will I be able to accurately judge the racket? Is it possible that it may be a racket I would like, but the poly strings would cause me to think it was a bad racket? Should I not demo with it? Or, any tips on how to do the demo with polyester? When playing singles I am a steady baseliner at the intermediate level, not a very hard hitter, but I do also play doubles where I volley a lot. I hit with moderate topspin. I am probably a 3.5 - 4.0 USTA. Please advise.