I've found some major issues with mine, which I've played on the PSP rather than the PS3. Every so often, the screen just farks up into a mess of coloured pixels. It first occurred in the tunnel on route to the Sector 5 reactor, and it freaked me out, but then went away. It came back in the barrel-throwing exercise, where everyting except the barrels turned to crap. I couldn't read the text, see where I was, or pretty much do anything.

Aside from this, it's exactly the same. It's cool that you can access the manual by hitting Home, but that's probably the only difference.

I recommend to anyone who already owns this game to NOT buy it. I don't know if it's my PSP, or whatever, but it's a total mess.