always thru it - I don't like air hitting my helmet - and I get an eye strain headach if go between screen and no screen. I rented an ultra in vegas last weekend the top of screen was right at line of sight - ended up with headach, neck pain from slouching and back pain from sitting straight up too long - finally took off the screen kept in motel room - riding was mostly slow stuff ok
Over - and with the recurve style windshields the wind gets directed up and over your head. If you look thru the shield then bugs become a problem and scrubbing them off a couple times a day while on a road trip will end up scratching the shield leaving you with a distorted view.
FYI - I am only right 95 to 98% of the time. HeHe