X2. As long as you stick with a good tint, like 3M or Llumar, you won't have any issues. When you use tint from Kragen/Vatozone, you'll have issues with the tint turning purple.
I get my tint from a local shop. He cuts Llumar for me, whatever I need. All the windows for my last boat was 35 bucks. I applied it in about a hour...