Interesting, other 3m products are real good, but that's kind of how things are, one company can't be the best at everything.
I'm from Michigan, so tinted windows isn't exactly common here lol. The only tinted windows I get around are so old the tint is purple and generally pealing lol.
I noticed on my dad's RX300 that the windows have an almost mirror like look to the surface. Not sure what that is exactly, but it seems to shed away the heat fairly well and inside the car it doesn't seem to be tinted too much, but don't know what % it would be.
Random google pic.
The camry's I'm used to doesn't have the same layer on the windows. They still are reflective, but it doesn't have the same look or effect.