I personally love tint. I think it looks great, keeps your car Much cooler (cools down faster and requires less AC through out the drive), criminals are less likely to break in because it's not as easy to peek inside and see something on the seat that they want, protects the interior from sun, protects YOU from the sun.
OH and it gives you and your partner more privacy
I did and usually do, 20% in the back, 35% in the front. 35% is just light enough to not be a hinderance at night, at least where I live.