We took a little ride yesterday into East Alabama, where the very end of the Appalachian Mountains terminate near Mount Cheaha State Park. All together, about 200 miles or so, with speeds up to 100MPH, but mostly cruising about 65mph. The windshield is solid as a rock...no vibrations at any speed. Good protection at any speed, with no real buffeting that can be attributed to the windshield. In fact, at 80-100mph, it seems to get even better with regards to pushing the wind up and over the top of my helmet. I wear a Nolan N-102 Flip Face helmet, which has the sunshade visor in addition to the regular clear...I typically don't like the sun visor all the way down, so usually have it a notch up so that it is not directly in my line of sight but keeps the sun out of my eyes at that position. With the stock shield, past about 60 mph, the wind would knock the sun visor down to the fully closed position...with the new Cee Bailey, that was never an issue.
It is definitely shorter than the stock shield, but the net effect is probably about an inch difference because of the way the CB is designed. As suspected, I am right on the edge of needing the 13"...I can see over the top of the 14", but out about 100 feet or so, and if I tuck down just a bit, I'm looking through the top inch or so of the shield. Because of the design, this is at the apex of the curve on top of the shield, so in the twisties, when you're really looking slightly off to the side of the apex, the shield does not interfere with a good view of the curve you're in. It's kind of hard to explain...
All in all, I'm happy with the windshield....I like the looks a lot, and the wind blockage is much better than the stock shield, IMO. I am just a little torn about whether I should go with the 13" version...like I said, I'm right on the border between the 13 and the 14", but given the design of the RGU fairing/shield, and how far back you're sitting from the shield, I think if I went shorter, it might be just a bit too short, and I'd get some top of the helmet wind that I don't want, so I think I can live with looking through the top of the shield on uphills...on level ground, I see over the top fine, just not 50' in front...more like 100'.
Just for comparison, and everybody is built a little different, I have about a 28.5-29" inseam, and I'm 5'7.5" or so. If you're 5'7" or less, I'd definitely go with the 13" version, and if you're my height, up to about 5'10", I'd go with the 14". I'm always right in between on everything, including my pants sizes. b

Here's a few pics...