Well, if you ever want to get rid of those pro-stock mids, let me know.
I don't know if you necessarily have to be a better player to play with Mid+'s over the Mids, the Mid+'s just offer a more versatile string bed and a tad more 'pop'.
But spec-wise, they're almost identical. At least the important specs, balance, static and swing weight.
In fact, gram for gram the Mids swing so much sweeter than the Mid+'s and at my level, it really doesn't make a difference which one I use. I won't gain/lose that much, ie- I'm not gonna be a 5.0 by using the Mid+ or drop down to a 3.0 by using the Mid.
I don't know.