i am a 4.5 player and on good days with the 002Tour I have lost to a 5.0+ hitting partner 6-7 and 4-6.
my game is all about my first serve... and when it is on, i am a tough opponent. lots of aces, 2nd serve aces, and easy points. but when it is off... and it can go off very easily, my confidence wilts and i play horribly.
(on bad days... it is 2-6 and 1-6 losses)
I have decided to get a lighter frame with hopefully lower swingweight and see how I do then.
Of course, when I play lesser players, I have much more time and the Yonex feels superb. But I want to compete and hopefully beat the 5.0s, and while it might just be my shaky game, I think 5% might be the racquet which is a bit too demanding if I am not "feeling it" that day.
Most of the 5.0s I know play with tweeners, so it also looks a little silly when I am the only one that didn't play Div.1 tennis but I am the one using the heavy "tour" frame.