"My advice to you, DO NOT get anything darker than 20% on the front windows. You want to be able to see out at night.
5% is very difficult to see out at night when there is no light around, or even in lit parking lots you may not be able to see pedestrians behind you or other obstructions. Plus, during twilight hours where the sun is rising or going down, people that have their head lights off are INVISIBLE. You will get into an accident, ESPECIALLY motor cycle you will not be able to see them. Even with lights on some times, the blinding light/glare during these hours with a DARK DARK tint makes it impossible to see out. Use your head. Same goes in severe down pours or bad visibility conditions. Again, you want that balance."
I have never had a problem with 5%, if you can't see, you put the windows down, very simple.
"If you tint the back window, do NOT go darker than 20%. You want to make sure you can see out, and if you have a COP behind you, you want to make sure he can see in within reason so you don't get stopped for a tint violation"
Up here you can paint your rear windows black if you want, totally lawful.
"Putting 5% all around the car, bad idea. For safety and for the risk of getting stopped"
Done this for years on many vehicles, never had a safety problem nor have I ever been stopped for it.