Kristie there seems to be an endless debate on stock versus aftermarket solutions to a lot of things.
In our case, my R12ST and my wife's F800ST, a taller screen raised the air stream to just above the face shield, which DRAMATICALLY reduced buffeting. I could hardly tolerate riding my wife's bike with the stock screen because it put the wind blast directly at my head. She's shorter than me, so the Cee Bailey's provided optimal comfort for her and a good compromise for me when I ride her bike. I did the same thing on my R12ST and I have a nearly perfect riding environment, particularly on windy days.
As for the BMW tall wind screen for the F8ST, that's what is on the bike from the factory. I first purchased one of those to replace the stock screen not knowing its dimensions. Turns out it was identical.
The trick here is finding a screen that is the correct height for your riding posture. Because we're all different, longer/shorter torsos, etc. it's difficult to just "pick" the right screen without a thorough test ride. Because I went through this trial and error with my bike, I had a pretty good idea what we needed to do with my wife's bike. All this said, for some riders the stock screen is best.
