The polarization is very noticeable on the Graphene Speed Pro. I couldn't get used to it. You have to have a fast swing to maximize the benefits of the polarization. I didn't care for the feel either, but that might have been due to the Head FXP Tour string on my demo which I find pretty numb.
I think the IG Prestige Pro is the better all around racquet, but I play singles and doubles and like to come to the net.
I wish they had just made a heavier version of the Graphene Speed MP and called it the Pro. The Graphene Speed MP is very easy to play with. I found the Graphene Speed Pro more finicky.
TW Head Pro Tour 280 Club Member #16 / Various Head Instincts