Read the FAQs for more on windshields.
I did, and while helpful, it didn't give me all the answers I wanted.
I think did though, and it looks like I'll likely skip the Givi/stock screen.
I don't mind some wind, but if I can cut it back in the winter, that would be great. I've been riding sport and/or naked bikes for the last 10 years, so even the shorty screen is better than what I'm used to. I won't put up with a lot of turbulent air though...
I DO prefer to look over the screen, rather than through it.
ETA: The windscreen on the bike measures 11.25 inches, and comes up to approx the middle of my chest.