I've had 35% on the windshield of 4 out of the 5 vehicles I have owned and will continue to get it on my future vehicles. I love it. Makes it so much easier to see out of in the daytime. Believe it or not, it's easier to see out of at night too because it cuts down the brightness and glare of oncoming headlights. I have 15 all around and 35 on my windshield. For visibility it is about perfect day and night. I still would like to have 5 all around for privacy though. Just too cheap to get it done lol.
I can get pics tomorrow if you want.