I have 1000 miles on my bike now, and have been riding in some pretty good gusts due to weather around south Louisiana lately.
Initially, the bike was delivered without windscreen per stock setup. I did notice that the high crosswinds would effect the bike, and especially when passing flat front 18wheelers at speed. A lot of this seemed to be unintentional steering inputs from my arms being buffeted. (coincedentally, I observed this same situation with the Buell Ulysses with the original Dunlops. Relaxing the grip on the bars damped the oscillations.)
On the 600 mile checkup, my dealer installed the sportscreen, which made a difference in crosswinds. It seems to desensitize the steering due to the wind pressure on the bars. Only problem is that the sportscreen, for me, puts the buffet rignt on the bottom to middle of my helmet and creates a nice rumble in the lid.
I just installed the "tall" screen, which is wider, and it has moved the buffeting to the top of the helmet. Since the screen is wider, it has really improved the crosswind stability, again probably due to the wind pressure center.
Jury is still out on the tall screen, but it appears if it were abou 2 inches taller, the buffeting would be above the helmet completely. Laminar Lip attached to the screen will probably cure the problem.
One nice feature of both the windscreens is that you can remove them by removing two screws on the bracket ends and rotating the forward part of the bracket out of the clip at the front edge. You do not have to remove the plastic screens from the brackets. Nice touch BMW !
I LOVE THIS BIKE
Motorcycle Consumer News will have a R1200R report next issue !