Call me a wimp but I wussed out of the tint all round and settled for 3m Color Stable life time warranty 5% rears. It looks great, I would of rathered a light tint on the front but I decided against it.
Why?
Well I did a little research and CA limit is 70% for the fronts. Apparently most factory car manufacturers windows are already 75-85%. So applying even the lightest 70% tint to the window would in fact A) be useless and B) actually make it illegal.
I'm not worried about the fix it tickets, I got one on my 535i when I first arrived in the CA and had 30% fronts, I'm actually worried about getting into an accident that is my fault. However unlikely people have commented, it is, in my opinion, entirely possible for an insurance company to reject a claim where you are at fault if they can prove the window tint was a factor. With state law stating 70% is the limit on the fronts I suspect this would not be difficult for them to do. Being a new car valued around 34k-ish if I where to get into a big accident or cause health damage to someone, they would seek any clause they could to not pay out.
It looks great, being black on black it actually makes it look so much better and the darkness of the rears make the fronts look smoked, i'm happy, but I would of liked 50% on the front.
