I put 35% (legal limit at the time) on my side windows and 20% on my quarters and hatch 5 years ago when I bought the car, and one month later, Missouri changed the laws so you can go darker. I think 35 is nearly worthless if you're doing it for looks. You can see in my car nearly as well now as with clear glass. If I were to do it again, I'd probably go 20% on the sides and 5 or 10 on the quarters and hatch. However, if you have trouble seeing, keep that in mind because obviously the tint will be harder to see through. I do fine now, but it took some adjustments to get used to it.