Thanks for the good info, JMG! I checked out your installer's FB page. Your guy does really great work and I found the pictures to be most illuminating. In particular, there was a 70D that's the same interior and exterior colors as my car which gave me a good impression of how my car might look after tinting.
Also, this quote caught my eye:
"Most factory windows and windshields are claimed to be "clear" at only 70% visible light transmission. So, the 75% Spectra Photosync is 5% more clear than a factory windshield or window. That's why this product is completely legal for your windshield. The Texas DOT law states that "A clear (un-tinted) UV film is allowed anywhere on the front windshield without a medical exemption being required.""
Sure enough, I looked up the law and that's exactly what it says.