Max, I've used a homemade version of the MRA x-screen on the stock 08 shield. I started out testing the concept before I spent the money for it and ended up spending 20+ hrs on it. Could have worked overtime at work and been hundreds of $ ahead! Mine requires tools to adjust, so a major improvement of the MRA version would be tool-free adjustments. I don't have one but I do believe the MRA airfoils are adjustable without tools. I've seen them on other bikes. I think you could just reach out and move it while riding. There are some threads on them on this and the COG forum. I attached a pict of mine (airfoil in down position) and a picture I found with entire MRA shield with airfoil.
It works pretty good. The stock shield in the up position was really bad for me; lots of noise and buffeting. I figured it was so bad that justified drilling holes in it to improve it. I put a Cal-Sci type hole in it too. Anyway, with the airfoil in the low position (top edge about 2" higher than top of shield) buffeting and noise with the shield up is much better, not perfect but much better.
With the air foil in the "up" position, it's really quiet with just a little buffeting on top of the helmet. Although the top-edge is in my line of sight. I think if my airfoil were taller it might have been buffet free and the top edge out of my line of sight and looking through it. I tried attaching the airfoil higher on the shield, but then there wasn't enough overlap, i.e. there was air coming through the gap that was causing more buffeting. Angle has a large effect on how well it works also, so that's bit of trial & error. Overall I think the airfoil is a good idea to cut down on buffeting since it cuts the air pressure differential way down across the top edge of the whole shield. Takes some tinkering though. I have a real Cal-Sci extra large for cold weather. I get some air dancing on top of my helmet with it. Some kind of airfoil or laminar lip on that would probably make it more buffet free but haven't tried it yet.
I think if the airfoil were wider that would cut back on buffeting around the sides of the helmet too and after looking at pictures of the Laminar lip on many bikes I'm thinking they make them wide for a reason, although the laminar lip is not as easily adjusted as the MRA x-screen I think.
Search for other threads on more complete info on the X-screen.
Good luck!
