I'm probably insane not to have tinted windows, living in metro Phoenix as I do (with our first 100-degree day predicted for Monday), but I've never had it on any of my cars.
I am so infernally picky that I just don't think I could live with it. On nearly every tint job I've ever seen--even the best--I've found little imperfections I just know would give me endless grief were the car my own. And, of course, no tint job lasts forever . . . especially in the brutal weather I endure. There are any number of cars with puckered, distorted window tint on our roads here.
I think tinted cars look wonderful when I see them go by, and that's fine for others, but I know I couldn't endure all the worries about scratches, picks, uneven edges and the like. No thanks.