Ok, so now that I've had the Cal Sci shield on for a couple weeks... here are my impressions...
Just for references, I'm around 5' 9" tall, have a Rick Mayer seat, and use Heli Risers.
The Cal Sci shield is the Medium, and is 3" taller than the stock Yammy shield, and a significant amount wider as well (note to self... go measure the width difference).
1) I definitely get less buffeting behind the new shield versus the stock one. My shoulders are now apparently out of the turbulence, so my jacketed arms don't seem to get smacked as much.
2) With the shield all the way down, the airstream hits me smack dab in the middle of my faceshield... which I like. Raised up about an inch and I'm in a very quiet neutral pocket. Raised all the way up and I get more back pressure than I ever did with the stocker.
3) All the way down, I can still look over the top of the shield easily. Even when I raise it up to get in the neutral air pocket, I'm still looking over the shield. As mentioned above, at full rise, I get a lot of back pressure, so I doubt I'll put it there often/ever... but if so I do look through the shield at that point.
4) I seem to have significantly less bug hits with the new shield... don't know why, or if it's just a less buggy time of year... but I'm not going to argue with it, because I hate bug splats on my faceshield.
5) The edges of the shield look a bit less "finished" than the stocker. Cal Sci. could apparently take a few minutes and sand the edges down to make it look better. Apparently they cut them out with a laser, and you can see some of the curve transitions are a bit abrupt.
6) Haven't seen anyone else mention this, but there is a big difference in the curve of the Cal Sci profile versus the stocker. If you lay the stock shield down on the floor, and put the Cal Sci. shield on top... the Cal Sci shield has a much more pronounced profile curvature.
7) Don't try to overtighten the plastic windshield mounting bolts. I snapped one of the heads off, and I didn't think I was being too rough with it.
Just initial impressions. Will post some pictures later. All-in-all, I think I'm going to like it.