I saw this a few months back and was very impressed with it. I had wanted to see it years earlier, but never got around to it. Really one of those movies where you put yourself in the characters place and wonder what you would do.
Billy Bob Thornton played his role well so well. I actually felt sad for his character. I've yet to see Sling Blade, but after seeing him in A Simple Plan I imagine he plays the role very well.