I replaced my OEM with a Clearview I got from one of the members that had gone to an F4.
The Clearview I have is shaped to deflect the wind, is lightly tinted (not really noticeable), and has the vent. Stock height.
Nancy has noticed more airflow on her forehead (full face helmets) but no buffeting.
I like having the vent because mornings where the OEM would fog up on the inside the Clearview doesn't. With the vent closed, air is deflected up the inside of the screen (top of vent has openings). As for pros/cons of the vent, if you want it closed you close it, or open it to multiple stops to get the amount of air you want.
The wider screen helps with keeping some (not all) of the cold air off your hands.
From reading, sounds like people that had the Clearview went to the F4 (which I think we get a discount on as well as the Clearview - check discount section). Some went Baggershield...but I think most went F4. People have said that the tint on the F4 is darker than the Clearview but I don't believe it is vastly greater...but is noticeable.
Don't think you'll be disappointed in either the F4 or Clearview. Both are good replacements for the OEM.