Hi everyone. I'm a new member to this site and could use your help. I'm trying to decide between the Donnay Formula 100 and Pro One 16x19 and would appreciate any advice. After searching on this topic on this forum and reading quite a few posts, I noticed that a quite a few forum members started out playing the Donnay Formula 100 and enjoyed using it, but then switched 4-5 months later to the Donnay Pro One 16x19. Was there a common reason why? I'm starting to get back into tennis after about 20 years (I'm 41 now). I used to play competitive high school tennis (#3 singles, #2 doubles) and was a decent player (about a 4.0 - 4.5). I'm was an aggressive baseliner and but would move to the net whenever the opportunity presents itself. I imagine I'd still do the same today. I have a one handed forehand and two-handed backhead. My primary serve is topspin/sidespin but I can hit it flat when needed. Thanks again for your help.