I stopped at my 5* yesterday and spoke with the body shop about rock chip protection and he put me onto a detailer that they use for this service. The guy was quite upfront and stated that he felt he would be doing a bunch of these cars in the near future and had checked out the 3M shield and his quote to me was $250-$300 Cdn. I will have this done when my car comes in.
I had read somewhere on one of these 300 sites where someone had paid close to $1000 US. Yikes!!! Anybody interested in doing this should check around before buying. I wish I had done this protection on my 300M.