I've had all 3 on my Vetter: the above-the-forehead, the at-the-forehead and the 2"-below-the-forehead versions. I much prefer the lower ones. During the 55 MPH era the at-the-forehead version was better than the lower one that I had before the 55 MPH era, but at speeds over 65-ish MPH I much like the lowest type. It puts your eyes over the top of it while the wind is just cresting at the top of my (open-face) helmets, on which I wear a 1/4-length (made by me) shield with visor. The shortest windshield, at higher speeds, provides the clearest road views and least buffeting when big trucks on 2-lanes try to remove you from the pavement. As the windshields get progressively taller, the back-suction into the windshield from passing trucks get more and more severe. I currently have one of the middle-height ones mounted mostly because I've been largely commuting to work with it these past 5 years and seldom get above 40 MPH for long, and when it suddenly snows without warning here, or rains, it is easier to duck behind it to avoid wetness in my face. I call it the "commuter length" windshield, halfway between the shortest one for touring and the tallest one for [something I don't do?].
