I had my windows tinted but I am not very satisfied. Guy who tinted them stated he would match the back as close as possible within legal limits. To me the back appears much darker. I think he used 30% LLUMINAL tint.
I know what your saying, I had a buddy who was given 24 hours to scrape the tint off of his windows when I lived in Pittsburgh. Living in Florida, they are not so sensitive to it. To me it is almost a must have down here. After thinking about it, I should have just had the installer write me a cash receipt and had him put darker tint on and forgone the warranty. That way there would have been no record of it and he would have been able to install to match the back. Lesson learned for next time!!
FYI: As a general rule of thumb, the Federal Motor Vehicle Safety Standards at 49 C.F.R. 571.205 require that any glazing (i.e., glass) used in passenger cars, light trucks or multipurpose vehicles "at levels requisite for driving visibility" meet 70% light transmittance or better. The National Highway Traffic Safety Administration has determined that for SUV's like the Murano, this includes the windshield and windows to the immediate sides of the driver and front passenger. Windows past that point to the rear are not considered "at levels requisite for driving visibility" so may be darkened more than 70% - hence the privacy shading. This applies to minivans as well. States may only enact their own regulations to the extent they mirror FMVSS requirements.
I drove it straight from the dealer to a place called Accutint in Bellevue WA. The tint they used was Llumastar, cost $79 plus tax.
I picked the Llumar as I had heard it is clearer that some of the other products. Now that is has dried, it is hard to tell from the rest of the car.
I have similar tinted windows (20%) in another vehicile and have never been stopped or had problems seeing through. I would not reccommend going any darker though. You do see some 10% and 5% around - they look way to "pimpin" for me.