I had Llumar film placed in my car (unfortunately, in NJ, I was only able to do the back half of the car). I had mine professionally installed:
www.shadesofgraytint.com
Excellent service and a great tint job (in Phila. area). They had to use a piece of vinyl for the dot matrix area as they said putting tint there would turn out poorly. Check this link to see pics of the installed tint. I had questions about Llumar film as well, but was really pleased with the results (mine is the white 06 with the OEM spolier on the trunk).
http://www.cadillacforums.com/forums...-thread-3.html (Sticky Photo Thread?)