My F150 is the first vehicle I've had tinted, I had it done with the ceramic stuff to try and keep some heat out because I was parking in the sun at work. I had the fronts done to match the factory rear, I think around 18%. Been that way for over a year, maybe two now, and I've not had a problem.
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@41FanForLife, his stepson is a city cop and for a while they weren't even allowed to pull people over for infractions like tint, burnt bulbs, etc. because it was "targeting minorities". Not sure if that is still the case but I know it was for a while.