OP, PM sent.

Funny thing. When I used to do window tinting our tint van we drove around in had a tinted windshield. It was a special kind of tint that allows 75-80% of light through, so you couldn't even really notice. We used this kind of tint specifically for businesses that wanted to cut black harmful UV / heat from coming through their windows but also keep the windows transparent for display purposes.

On our tint van, it actually helped a lot with glare. Visibility was actually better because the tint blocked glare. I WOULD NOT suggest doing anything darker though on your windshield. Its unsafe and highly illegal. Cops will take no time at all to pull you over for this.

Curious, but I know the tinted glass on like mercedes is legal. Whats the % of that? fractory makes it legal?

Thats pretty much how mine was, when I had my side windows up it looked dark and you couldnt see in the front really but it looked fairly normal when looking out. with the windows down you couldnt even really tell it was tinted.

I did a really light 30% on my civic a long time ago and it wasnt noticable until I was in a car w/o it. It makes the Inteior almost black when looking in from the outside.