Personally speaking I would not recommend tinting a windshield. Windshield tinting typically causes optical distortions and can amplify the optical distortions already existing in every piece of curved glass. Plus tint adds glare, some level of glare regardless of whether its ceramic or not.
Also consider the windshield is designed to take the impact of a body part in the event of collision (yielding least possible damage to passenger). Adding film can change these properties and cause cause additional damage to passengers in a collision situation. Have you ever seen what a windshield looks like after a body impact?
I'm not making this up. Its well known throughout the tint industry amongst professionals. Your installer may not know, but tint manufacturers are aware of it.