I tinted all of my windows to 5%, but I also have a vert and the windows are down most of the time anyway. At night it can be difficult to see out of the windows, but I'll just put the window down if I really can't see. Living in TX I don't really have to worry much about being too cold where I need the windows up.
My vision is really good also, so that is another way I justify it in my head.
