I had my tints done at BMW TO, 35% and agree that while they are not that dark, it is easier to see at night and looks good
My brother had darker tints and if you have the option with self dimming mirrors, he need up removing the tints as he could not see well enough at night
On the prep side, they did a great job... No complaints at all
They included tints and black kidney grills for me, but that was bc other dealers were jerking us around when they were sourcing the car.
Overall, great experience with them so far.