Lighter tints (say, 50%) often have better heat rejection than the darker (say, 20% tint) - so you may want to get a standard tint on the main windows. The "clear" tints (normally 80-90% visible transmittance) are good for the windshield if you are into that sort of thing.I'm not a fan of dark tinted window but heat rejection does have its appeal.
Of course that's the reason for the law - I'm talking about backing up safely and checking blind spots with a dark rear windows at night. With the dark tint on the Volt back window, headlights are a mere suggestion as soon as the window gets dirty...The real reason for the limit of tint is actually more to protect Police officers making traffic stops.
(They don't see you, even if you think you made eye contact and formed a deep emotional bonds that will last a decade until you reunite on the beaches of Rio de Janeiro. They didn't see you at all and if you expect them to drive as if they didn't, you will not be unpleasantly surprised.)I hate tinted front windows because I occasionally ride a motorcycle. I like to see other drivers' eyes to make sure they see me.