The helms book says the metallic tint will interfere or block the GPS. Has anyone had this problem?

 

There's TONS of threads all over this on the internet. I've got 15% Sungard Metallic Tint (their highest line of it) and I've had no problems. There are people saying they lose the signal in some cars and some that say nothing happened/happens. For the price of ceramic....i don't think you'll notice a difference.