I live in Oregon. If I lived in a sunny climate it might be different. Even a tiny bit more tint at night would bother me. Especially on our dark, rainy winter nights. I can't see shit on those nights.70% (clear) ceramic film on the windshield will block about 50% of the heat and 99% UVA and UVB to protect your dash.
I have it on my Burb with a 8" 5% strip at the top. Works great and no issues at night. Really helps with the heat here in FL.