Well, just speaking from the experience Jimmy's had with his glasses, I don't think it would be worth it. The tint responds so slowly that by the time it had tinted to the full level needed, your eyes would have adjusted. Also, I've noticed that the tint doesn't appear to gradiate like it should. As the light gets brighter, it doesn't respond right. It should gradually darken, but it doesn't.
Also, I'm surprised no one's mentioned the automatic tinting capability that KITT had.
