My girl did this as a present from a local body shop to my focus wagon using the same color as the car (Sangria Rdd) cost about $50 for both mirrows and 2 years later they still like new. If I had a digitla camera I would post pictures of it.
I have mirror tint on mine; had bee there for about a year, didn't fade yet.
The guys at the place I bought it from (a shop that does tint professionally), told me that commercial grade is metallicized and doesn't fade unlike what you buy at a parts store.
I don't know if it's true or not, but the tinting film I got from then did feel much heavier than what I saw in stores. The car has been parked outside for a few months after I tinted it, but was garaged for most of the year.