Spec is bang-on about protecting your hearing. Once the damage is done, it won't heal itself... EVER!
I added a Cee Bailey's sport shield to my 2009 and really like it. The stock shield directed the air right to my neck which in the cooler months is no fun. The sport shield directs it and the bugs just over my helmet at slab speeds. Funny thing is, yesterday I received a new helmet (Arai Signet-Q) and now I have more wind noise than with my old helmet (Arai XD3). Crap! If I slouch down a bit or stand up some the wind noise diminished greatly. Will play with the angle of the shield, removing the ATV seat pad or adding a lanmar lip to the shield. It never ends!
01 Jeep XJ w/ 200,000 miles as of 3-26-11