Hey, so I have an opportunity to get either of these rackets, one being bought off a friend (Z-Force) or a brand new VT9. I was wondering, if anyone has used both, how much the weight difference would be, and how much harder the swing would be between them. I'm a singles player, with a fairly strong smash, but I'm looking to come back to using head heavy rackets, as opposed to my Nanospeed 100 at the moment. My big concern is with the VTZF, is that it might actually be a little bit too heavy to use, or keep using over a long period of time, where as the VT9 won't be quite as stressful on the arm for extended periods of time. So yeah, any help would be great, thanks!