So, I bought a couple well used Pure Drive +'s from a college player for $50 total. I thought it was a pretty good deal, especially since I'm loving the racquet. I realized they are the older ones with the old paintjob (looks similar, but has some lightning bolt thin lines on the neck). Anyway, I'm just getting back into tennis after about 7 years, so I'm not current on the new gear. My question is: What, if any, are the differences between my PD+ and the current model (aside from the PJ)? Thanks.