The movie itself is fantastic - a fact which has been well-documented. It's a story of an amazing friendship. I liked it so much, I bought the DVD, soundtrack, and now the Blu-Ray. For this review, I would like to focus my comments on the Blu-Ray itself.
The video and audio quality are both brilliant. Audio is indeed DTS-HD Master Audio as the box says, though it is only 2.0, which some equipment may handle incorrectly. I have an Oppo BDP-80 paired with an Emotiva UMC-1 via HDMI, and the audio sounds great. The UMC-1 recognizes the audio stream as DTS-HD MA 2.0. If you think the audio doesn't sound right, try running without any effects or matrixing (e.g. NEO:6). By the way, the alternate audio tracks are also DTS-HD MA 2.0.
Now, for USA fans: The disc is not region-locked, and the main movie and menu will play just fine on your Blu-Ray players. The special features are PAL, so you will need a player that can convert PAL to NTSC. The special features play fine on my BDP-80, for example.
If you're a fan of the movie, this Blu-Ray is a no-brainer, especially at this price. Get it while it lasts!