Just got my game today and thank goodness I looked into this thread, otherwise I may have never known about the DLC.
As far as attaining the DLC goes just go to the game's HP, go the "Special" section and it should take you to the screen where you'll enter the product code on the back cover of your game's instruction. Upon doing so you'll be given the code that you'll need to enter in the PlayStation Store as if you're entering a code for a PSN card. You should then be taken to the DLC page.
Now...
As far as the game goes, I'm thinking that its ok for now..I just started sequence 7 so. I'll wait to say anything more til I get more done in the game.
*EDIT* Oh dang, looks like I was beaten to the punch.
