I've seen the film tinting done by a professional outlet in Milton Keynes and the results are very very impressive. He takes out the glass and the results are stunning. It's something I quite like the idea of for the rear doors. All the other glass is factory tinted anyway but dark tint rear door windows is very stylish in my opinion. It's unlawful in front side windows and windscreens if the optical transmittance is lower than 71%.