The folks that did my tint said the small amount of movement opening the door wouldn't be a problem. The only time they run into an issue he said was on some model BMW's. Something about the seals being pretty tight on the door. I have had mine (35%) since about november and don't notice any difficulty seeing out them at night. Any darker than that is illegal in Illinois, although my last car had 25% and never got a ticket
Just try to find an installer that gives lifetime warranties on the tint. Any bubbles/tears I get, they replace no charge as long as I own the car.