Yeah, it's grainy, but it's supposed to be. The images are always clean and crisp, and no unintended grain or artifacts pop up. The video print is terrible, so I am glad they cleaned it up for us DVD folk. The audio is superb. There are background sounds pivotal to the plot-line, and they come through clear, helping the movie deliver it's intended message.
Music is rare, but when it does appear, the dialogue seperates well.
You name it. Two commentaries, one by director Darren Aronofsky, one by actor Sean Gullette. These really help bring into focus what Pi is all about, even to those who watch it religiously. And no, this is not labeled a special edition. Artisan, you kick ars.