I really wanted to convince myself that I liked the V-Stream. But after 200 miles of testing, I pulled mine off repackaged and will return. I plan on ordering the F4. I think the flexing at highway speeds for several miles would be quite annoying. When it was completely down it performed pretty well. Keep in mind if you order a vented one you will need to order an OEM vent and grill for a 2008 Wing. The after-market had a 1/4in gap at the bottom corners and would not stay in place. I think I will order the F4 without a vent, the vent never really did much for me anyway.