The previous owner of my Ironman had the windows tinted limo black all the way around. I really haven't gotten to replacing it with some good stuff yet. I can tell you that the dark stuff really impairs my night vision, I have to lean forward to look out the windshield when making left turns. Also, the side mirrors become useless.
On the WRX I had some bronze metallic tint that did wonders for keeping the interior temps down. It looked tasteful on a silver car, and it had excellent optical qualities. I only did the back three windows, and I always parked trunk to the sun.