I too have an 06 C2S coupe, and had it tinted with exactly what you are looking at. Formula 1 Pinnacle 35%. I've used Formula 1 films for at least 10 years exclusively, and had my E55 tinted with the 35% Pinnacle 18 months ago. It holds up well, doesn't scratch, and the cops tend to ignore it as it is not at all reflective. I paid $325 for the tinting on the Porsche.