I have already seen Zodiac (not the Zodiac Killer), because Fincher is my favorite director. I really didn't know anything about this case before I watched this movie. The movie was really good. I very rarely get scared in movies, but there is just one part that clenched every muscle in my body as I watched it. My hands were gripped to the arm rest. I don't want to say much without giving anything away. So i'll just say it involved "the basement." (How's that for creepy) Anyway you'll know what i'm talking about when you see it.
I read a little about the case after watching it and the most interesting part is that he wrote 4 ciphers and only 1, and not even the whole one at that was ever decoded to this day. They must contain so much evidence and insight.
The other thing that stood out to me, is that whoever this guy was who did this had to be wicked bright. I mean a very intelligent sort of person. And the portrayal of the main suspect in this film doesn't seem to match with my idea of what sort of person would be capable of something like that.
The movie is pretty long but it's pretty engaging, you don't really feel it, it sucks you in like a good book. It's a great kind of movie for Fincher, takes you back to his Se7en days. Some of the overhead shots especially are really great.
But nothing will ever beat Fight Club.