This is good common sense! It is unreasonable to believe that any fixed-position screens will perform for everyone the same. Since we are all different, one's torso being taller-shorter than the next, adjustable heights or a spoiler that adjusts is a must! Those lucky enough to fit behind a factory screen, like the new one seen on the 2014 F800GSA, will LOVE it, those experiencing buffeting, won't...pretty simple. Experimentation is expensive, knowledge is priceless. Best way to find "your screen" is to find other bikes, friendly riders, and attempt to get some time behind the screen! I got to ride behind a GIVI I was contemplating, I HATED it at highway speeds, buddy loves it. For a minimal amount of expense, I corrected the airflow on my stock screen with the addition of a spoiler, Wunderlich worked best. Ultimately, finding a screen with the most adjustable height would have been the best, but then again, economics weighs in. Currently, I am looking into the Britannia Mirage2 because it offer me two very specific additions to my bike; First, I can *tune in the height and drop it down when off-road-ing my 13 F800GS. Second, I will be able to mount my GPS in the line of sight which reduces risk by keeping my head up! A side benefit, the Mirage2 add something different and a place to hang more obnoxious stickers from my adventures!