The F4 is an amazing product - their display at bike shows with the steel wool NOT scratching their windshield is very impressive.
And if you are like my namesake, Steve 0080, and MUST have a vent, these are optimal.

I went with Madstad because I thought the two piece in dark smoke just looked cool as sh$t and gave Isleen more of a badass look.
And, it works well at throwing wind & rain over the pilot and not at the pilot.
Cheers,
Steve