I have a F9, it is a powerful but slow racket.This racket is an defensive racket. If you dont have good jumpimg smash skill, u cant squeeze out the potential of this racket for attacking. Advice not to get this racket unless you are a advance to professional leve.
I have a F9. It's fast for a powerful racket come on. You should try the head heavy powerful rackets, they are far more sluggish.