I bought a clearview about a month ago. I got tall, wide , vented, tinted. I took off a shorty show chrome. I got it so my passenger would be better protected. It does that. like the vent, it removes the low pressure zone at hiway speeds. They teach you to measure from in front of the fuel filler to the top of the wind shield. I suggest a yardstick and a level to get an Idea of what you need. I can look right over mine and the wind hits me right at the top of my head, out of my face. The shield is different shape than stock and it is noticeable. I bought clearview instead of F4 because of the shape(recurve) I have not had a F4 so I can not say it is better or worse, only I am pleased with the clearview.
Good Luck
Bill