Here is my 2 cents as a proud 5'10'' owner of a Calsci, a Givi and MRA Speedscreen. The best looking screen on the bike is the MRA, but it is the least effective. It is ok under 40mph but any speed higher than that and the ride quickly becomes tiring.
I then switch to the Calsci: the bike simply looks stupid with this oversized screen which is ok for a cross-country ride but not really for commuting. Now, for me, aestethic is secondary to ride comfort so I tried the Calsci in all kinds of height and angle settings. At various heights, it does a good job of blocking the wind but at speeds over 55mph, I get a lot of buffeting. I then tried changing the angle (leaning the top of the screen toward me) and it does get better, but it does impair on the fork turn angle.
Lastly, I tried the Givi and it is good looking. I first installed it on the highest setting and I was still getting wind on the helmet. I drilled a couple of holes on the lower side of the screen to raise it and it moved the wind to the top of the helmet but I was still getting buffetting at 55+mph. I changed the angle (again leaning the top toward me) and it does improve a bit.
MRA: best look, good for around town commuting, not for highway
Calsci: worst looking, great around town, some buffetting at highway speed, but impairs full fork turn. I have not excluded it yet as I am thinking that I could cut the sides to restore the full fork turn, but I am not sure the effect it will have on the wind flow
Givi: best compromise for now. I may be extremely demanding and maybe the zero wind/buffetting is unachievable.
BTW, I plan to swicth back and forth between the Calsi and Givi one last time and will then keep only one screen. So for anyone interested in a windscreen, I will have 2 for sale soon.
Last edited by FouDuFafa; 09-10-2008 at 10:23 AM.