A little window tinting (gray or bronze) both is and is not a big deal. It can really help in reflecting heat back outside, lowering your cooling bills. That being said, you won't notice the outside going dark or gold because or the tinting.
The dark gray tinting is a requirement for waterfront properties in an effort to cut down on light pollution on the beach. This light can distract baby turtles from going to the water, resulting in their deaths.