I just had my WRX tinted with 3M's Color Stable tint. CS20 (20%) all the way around. This is my second car with Color Stable and I love the quality of the film (I like it better than Lumar which I've had in the last- looks better and I never had an issue with it). I debated doing the 3M Crystalline, which is basically clear tint, but blocks most of the heat and UV rays but doesn't obstruct view at all. I read that it's a lot harder to install and has more imperfections than other films, so I just stuck with the tried and true Color Stable.
I think it's a little too dark for my tastes. I had 35% on a black vehicle before and that looked perfect, but I figured since this vehicle is silver, I'd need to go darker. Whoops. I assume I'll get pulled over and have to strip it off soon anyways.. $325 for the film and installation. Had a few small bubbles, but I'm sure in a week or two it'll dry out.
What's your favorite window tint film?