I rode up to Daytona, today, and met the F4 folks, and bought the clear +2 with the vent. They installed it for me, and I really like it. These are very nice people to do business with, by the way. I appreciate everyone's input. Especially concerning the vent. My other windshield didn't have one. Today it was 88 degrees, at one point, and I found that the vent really did help to cool me off, while riding.
On another topic... for those familiar with Daytona Beach, and the surrounding area.... What is with those red lights? They stay red for ages, and no one is moving in any direction!!!! In the past, on a different air-cooled bike, I would overheat at every light. No one gets anywhere very quickly, that's for sure!