I did HuperOptik for the entire car. Agree with the above post that if you do the windshield as 2 pieces you get a line. I hid the line in the visor area, so not noticeable unless you are looking for it. I wanted as dark as possible for the roof, and legal limit for windshield (30%) is a lot less. I did that (30%) for the windshield, windows and rear window, as dark as possible for the roof. Personally, I found without the tinting of the roof it was miserable, but it is your personal desire for glare, light and heat that will decide it for you. With it the car is much more comfortable for me. It was $1500 for the entire car, using i3 (HuperOptik's top of the line brand) here in DFW.