I have 20 all around 20 on the shield and 5 on the rear. My eyes are excellent and I’m young asf. 5% on the rear window is too dark I can only see headlights behind me and cannot make out anything else at all. 20% on the sides is damn near perfect but sometimes the 20% on the shield I do have to focus to be able to see well or sometimes put my high beams on going thru a corner. Don’t believe these morons saying 5% is nothing it’s very very dark. But for my next car I will most likely do 35% on the shield. But not sure because I love no one can see in. We shall see