I have yet to get my 09 tinted but my 06 had 15% on it for 3 years, and I never had a problem, got stopped twice and received a warning both times, both times I'm sure the cops were just making sure everything was in check, my area is full of tinted cars, and NY does not allow anything darker then 70% and NJ wants nothing on the front windows.
I did receive a tint ticket in Virginia, passed through a speed trap and the cop got me, it was either a reckless driving ticket with a mandatory court date, or speeding and a tint citation, I went with the speeding and tint, ticket was 200 bucks, the actual tint fine was like $35, cheap by NY/NJ standards, the car was a 300C with 5% all around with NY plates, the cop was cool but it was probably the easiest revenue he made, out of state I never had a chance
It was funny cause I told the cop the car was my brother's who was sitting in the passenger seat, and it was tinted for his privacy, as well as living in Marietta/ATL Georgia, to avoid the sun, but the Virginia State trooper knew the NY tint limits as well as the Georgia tint limits and since it was 5%, which was illegal in both states I got a ticket
