Hi
I would echo the comments above, I have had a MRA Vario screen on my 1150 GSA for a year.
Ive found it an improvement over the stock screen, even with Torbinators (Im 6.0), although I notice a deterioration if Ive Im using the Airhawk seat pad & Baglux tank bag. It seems to be something to do with the way that the air comes around the screen and flows over/past the tank. At least I dont get the awful bufferting. No a revelation just better.
I was toying with the idea of adapting some 1200 winglets to see if they would improve the airflow around the side of the screen, but was hoping someone else would go through the expense, pain & sacrifice first!
Torbinators with the screen raked back also improved the the standard screen, but I found I lost the chest protection from the elements.