I have tried different MoCo shields, KW shields and Clearview. In the looks department KW is hands down the best looking shield.
I'm attaching a pic of my bike with the 8" KW mounted. I've also tried the 14". The KW works great in normal city driving. You feel the wind, but it's more than livable. The 14" is a bit better, but it is made form the same paper thin plastic as the 8". The 14" relentlessly vibrates at highway speeds. Short highway runs are fine with either the 8 or 14" KW. However, if you are touring the KW shields are worthless! The wind alternates left and right endlessly beating your ears. You have to wear a helmet or hearing protection if you want to run long distances with the KW shields.
Clearview is the best I've found from a form/function/quality perspective. The recurve on the CV works great. It deflects the wind over your head as well as far enough to the left/right to keep it from hitting your ears. The CV plastic is also very thick, which is much safer if a rock or something is kicked up while riding. Another thing I like about CV is they provide everything you need to install it on the bike. It comes with the rubber trim, mounting hardware, etc. KW doesn't ship with anything and they don't sell the stuff either.