Tom,
I would be leery of this product. I seem to remember reading a review of this and it really didn’t do anything except provide a false sense of security. There are some good laser countermeasures out there, but I am under the impression that films and covers are not a good answer. This site has some great information that can help you in your fight against smoky:
http://www.radartest.com/index.asp
I have a built-in Bel detector with the laser blocker and it works VERY well. It ran me about $1500 installed, but I think it was well worth it. Like with most everything else, you get what you pay for.