Mine's always had a scratch on the driver's side, it's totally vertical, and you can't see it from the outside... doesn't bother me too much, if it ever gets worse, I'll have the tint re-done, and I will be sure to clean up the little piece of felt that's there, or even reinforce it with more soft stuff [8D]

 

my driver side window did the same. a nice scratch kinda in the center of the window