I have recently installed the Cal Sci Tall shield on my '05. I'm 6'0" /32" inseam. I also have a Rifle touring shield.
As far as I can tell the Cal Sci shield lets a bit more air circulate around it's narrower sides, as well through the center ports to cool you off a bit more than the barn door-like Rifle. The Rifle is much wider and thicker than the Cal Sci and is quiter, when fully raised, without the tuning bar. The Cal Sci, when fully raised, sounds a bit like a flag snapping on a windy day, unless I duck down a couple of inches. There is less buffeting than the Rifle, but it is not totally absent. I did notice that rain flows upward on the inside of the screen as well as the outside surfaces. This necessitates cleaning both sides of the screen regularly.
I actually find the Rifle quieter than the Cal Sci at times, since it has a large quite zone of still air behind it.
On a really hot day, however... you need the cooling breeze!
I think that a Rifle Touring screen with Cal Sci type pressure relief ports may be a great combination. I like quite air on long highway rides since I am not fond of wearing ear plugs (safety reasons), if at all possible.
I am very interested in people's experience with the new VStream.