Just too dark for me man haha
I think the factory thint is 18%, so its pretty dark. But its probably just because the GM tint is not a film. You can just add some 50% or 40% on the back windows if you really want to.
My brother put 15% over his factory tint and it was crazy dark. Almost as dark as the 5% without factory tint that I had on my 05. I'm going with 15% all the way around on mine next week when I get it done.
I have 5% all the way around. It is pretty dark as most have you mentioned at night. During the Arizona summers however, I love it. If you are going to go darker than the legal limit in your state keep in mind its probable cause to stop you!
Oh yea it's either you either like it or you don't. But yea I've noticed that tint even if its the same % sometimes some look darker than others