I'm 5'8" with a 31" inseam and have the 11" CeeBaileys on a 2010 SG. I have plenty of room to see over the top. I get just a bit of turbulence over the top of my full face helmet, nothing on my 3/4 or 1/2 shells. I ride solo but I imagine 2 up would see the passenger getting some buffeting. A 12" would still let me see over the top and provide for a passenger as well.

I like the looks of the CeeBaileys and I can hear the stereo at 80mph!!!

 

2010 RG and 6'2" w/34" inseam on a Mustang solo - I ditched a 16" KlockWerks. I should have gotten 14" from a sight-line perspective but that thing was very turbulent anyway. Too much buffetting comes around the edges for me. Replaced with a 14" WindVest. The WV works better plus I can hear the stereo now too.