I had the usual noise and wind blast with the original screen and so got the taller Metal Mule version and loved it, until a silly old sod reversed into the bike in a petrol station, I replaced it with a second hand Screen 10cm taller than standard (Givi I think), it caused massive problems from the first ride with it, wobbles and serious turbulence, real buffeting around the crash helmet. I tried to learn to live with it and gave it a week of commuting, 85 miles a day around 60 of it motorway, no mater what the weather or which helmet I was wearing nothing improved so I took it off and put the original one back on, threw the Givi one to the back of the shed, anyway I found it again this weekend and thought I would try again bit this time with a little mod of my own, I put the original screen on top of the Givi, drew around it and then took a dremel to it, in all I cut about 35mm from either side at the top and about 5mm from the sides at the bottom, left the length the same, so a very tall narrow screen, tried it today on the commute, works a treat, no problems at all.
I will post some pics when I get a chance.