I bought a CalSci Large for my 2010 Concours 14 ABS in an effort to find better wind protection at highway speeds. I was experiencing enough buffeting that I'd get a headache after 30 minutes or so of Interstate travel.
Ordering from CalSci was simple and communication is good. The shield definitely performs better than stock, and I only feel a little bit of buffeting on the top of my head at 70+. I have started feeling the back pressure for the first time, though. Feels like somebody is sitting on the pillion and pushing my head and shoulders toward the speedometer. I'm not sure if I'm going to be ok with this, yet. I might have to go with a Tall or something.
Compared to the stock, it blocks more air so on hot days it's a trade off, but it's much nicer at speed. It flows more air at the down position than the VStream I had on for a week and doesn't protect quite as much at speed, either. I would be looking through the VStream at full rise, and I'm looking about an inch or two over the CalSci at the same position. The VStream flexes like crazy when up, but I've noticed very little movement on the CalSci. Very clear without any noticeable distortion.
With the right size screen, I'd definitely recommend these windshields. For reference, I'm 6', ~200.
CalSci in down position
Full up
down again
up again
side view - full up