I don't have a wndscreen. I was originally planning on getting one, but enjoyed riding "naked". I did just get a Dart flyscreen to put on my bike, before my accident. I am hoping the flyscreen, when finally mounted, will remove some of the air pressure off my chest.
Anyway, the advice I got from my younger brother, who's been riding for years, is to be sure the windscreen is low enough to allow some air flow around your helmet or you will have problems. I don't think you want to be looking through the windscreen anyway.
The windscreen I was considering were the Windvest brand:
weblink here Pricey but others here have given them great feedback.
I'm sure others, with far more experience, will chime in as well. Best do some research.