Yes, 3M has a 7 year warranty I think. As far as darkness, I would find out what my local law max is, and then stay about two stages above that. In Savannah it was 10% forever and they just changed it the first of this year to 20% and have been steadily raking in the dough! It would seem you could be grandfathered in because it was done before laws change, but the law enforcement agencies dont see it that way. All they see is $$$ going down the road.
Oh, and if you go on road trips, make sure you find out the laws along your regular paths. These small town barni fife's are real jerks!
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