I use a Madstad, so over......always over.
Over with a full face helmet, I learned the hardway looking through with anytype of helmet in the rain, Impossible.I've been reading about windshields lately, and it's kinda got me thinking..... I read about riders that don't like to look through it, and enjoy them lower so that they look over it..
and then there's other's, that love the shield high, so they have to look through it ........
Myself I like a high shield, and enjoy looking through it....I feel that the higher it is the least amount of wind blowing on you..OR WHEN RIDING IN RAINY CONDITIONS, IT KEEPS THE WATER OFF YOU.. I did order my shield with an air vent already installed, which I believe was a great investment for riding in hot weather conditions and OR when starting to fall asleep while riding, It help to keep me awake with the air blowing in my face..
So what is your preference:::: High OR Low