see my thread about the same topic, with pics:
http://www.300cforums.com/forums/srt...-clearbra.html
as others have said here, go with a specialty shop, and non-metallic if possible. if they need to put any seams or darts on a car with windows this square, run away quickly from their shop...
my pics are 3M, 35% on the fronts and 25% on the rears/back window. any more of a difference and i'd be afraid it would be noticeable.