I think the screen really doesn't block that much wind. YES, it does help a little with helmet turbulence, but the rest of the bike is "unfaired", so as far as aerodynamic help. Fugeddaboudit.
I just like the way the bike looks with the windscreen, and I have had the Holeshot single light setup, and the buell dual light setup.
I have piccs over in the modification threads if your interested.