Personally, I love the versatility of my stock shield and the MRA bolt on spoiler. It functions almost as good as the Madstad. I have the clear spoiler and with the stock shield blacked out it is hard to notice that it is even there from a few feet away. In the lowest point, I can change the angle and get some protection or else raise it all the way for almost complete coverage---or I can retract it to the lowest position flat against the stock shield and I get all of the air I want.
This is my 5th setup and the only one that gives me every option for air movement that I can adjust in less than 10 seconds to fit the temperature of the moment.