I have. I thought it was really pretty. The colors were so amazing. I saw it in 3D. I have no idea really what the story was about. Mostly because I was distracted by the 3Dness and Garrett Hedlund's amzingness and the colors.
I'm kind of tired of Saw now. I liked the first one and the second one. I couldn't even get through the third one because it was too gorey. After that, I stopped watching them because they just looked dumb.