Did try 4 different screens, with and without deflectors. All combinations had negative effect on my comfort, namely turbulence hitting me between throat level (small BMW screen) and upper forehead (Clearview 22"). Did not notice any difference with the deflectors. Open face or closed helmet. And I am tallish but not crazy so at 186cm. My previous GSA with a tall Puig touring screen was perfect for me.
Now all of this plexiglass will be utilised to build a small but very expensive greenhouse. Kind of disappointing as I choose the Classic partly because of the screen. However I have now over 7000km screenless kilometres on the machine and I am very happy with it as it is. Looks better "naked" too