7 cars with metallic tint (worked in a tint shop earlier in life) and never had a problem, nor any customers reporting problems with radar detector range or usefulness...

"SOME STICK-ON WINDOW TINT FILMS ARE "TERRIBLE" TOO. Some tint films also have metallized layers. We've tested samples from Wal-Mart (Axius brand) and AutoZone (Gila brand)."

We used only ultra preium films like madico, llmuar, solar guard, etc. and what is being discussed here is cheap walmart type film, a big difference IMO.

I drive my XF daily and the radar detector has saved me many times, and from considerable distances. I am ticket free in this car, daily driven - I think that speaks volumes.

And I plan to have my car for many, many years and do not want purple film in a decade...