In terms of performance and stability Double Agent was probably my most horrendous PC gaming experience ever - I wouldnt wish it on anyone. I eventually gave up and went for the 360 version. Once I was able to actually play through, it wasnt that bad a game but not a patch on Chaos Theory. CT was much darker - my kind of stealth game. I didnt like the changes they made to the stealth system either, and the rate at which you were literally forced to progress, what with those silly timed sub-missions and whatnot. I did like the whole 'double agent' theme and that trust system though, forcing you to make moral choices etc...kinda neat.