I have a 17" honda with vent- I do not recommend it lots of buffeting at 60+
I tried the mra windscreen bolted to the 17" shield- did nothing much for me
I tried both 11 and 13" madstad and although it was better then the honda it still didn't do what i was hoping for. It did get rid of a lot more of the buffeting but certainly not all. At 5 10" i saw easily over the 13" The customer service at madstad was topnotch though.
Of course i tried the stock shield and combined with the large fairing it directs air at your head like crazy.
Next move (if i dont sell the bike) is a f4 plus 4 or a optic armor plus 4 or a similar look through shield. Never looked through one before but im willing to try. Heck my buddy has better wind protection (head area) on his old fatboy with a large shield he looks through.
It may just be that i am a woosy