I'm currently running the C14 stocker on my 08. I have been running the CB Euro. Typically I use that one in Spring, Fall, and Winter but have been using it this summer until recently. What caused me to move away from the stocker in the first place was a severe head shake that worsened when my wife was with me. No, it wasn't her grabbing my helmet and telling me to slow down because it did the same thing to her, but worse. It also happened when close to the big rigs. By the way, by head shake, I don't mean a mechanical issue with the bike. It wasn't a loose nut between the bars if that's what you were thinking.
So I went with the CB Euro which gave more protection and eliminated the head shake. Fuel economy dropped by about 2-3mpg. Over time I've noticed more buffeting noise with the CB. This was due to the unintended consequences of getting a Russell seat which put me up at least an inch or more in the saddle. Evidently I was close to the edge (pun intended) of the top of the shield. Rain and general wind protection were better than the stocker.
So back to the stocker about a month ago. The wind noise is there but it's quite different and strangely enough more tolerable as it isn't of the drumming variety. MPG went back up and I actually averaged about 50 on a three hundred miler on a combination of two and four lane with significant Interstate travel. I didn't experience any of the head shake I had before but then I am also running Baker hand wings.... Don't know if that has anything to do with anything.
End result, I think I'll stick with the stocker for the summer months and not carrying a passenger. I'll use the CB for trips in cooler weather.