I have ridden my bike with both the Cee Bailey 18" Dome and the 16" Euro shields. I prefer the looks of the shorter Euro Cut but the taller Dome Cut provides substantially better wind protection for me.
I'm 6' tall with a 30" inseam. I have a long torso.
Also note the larger washers on my shield. BMW provides tiny support with their tiny shield. I felt that with the larger shield that I should have larger supports so I went to Home Depot and got a bunch of larger washers. The shield appears more stable, but the frame that BMW provides is the weak link in the support chain IMHO.
The Cee Bailey shield has been used for the last two months and has made my bike much more enjoyable to ride.