So I watched this last night.
All I can say is wow. I have never watched a movie that has stunned me like this. I have watched the columbine security tapes and followed the coverage. (at the time I was in high school and it hit pretty close to home). But watching the development of the characters and then in the end with the security tapes WOW. After the movie ended I was in Awe. I have never felt this way after a movie the shock value was insane. Obviously everyone knows how the movie ends but when you see the whole plot unfold and you get to the end and it kinda of makes you check yourself and the reality that you live with.
Honestly I would not reccomend this movie unless you are emotionally stable. It could wreck havok on those that do not deal with reality.