Summary: Even though it's clearly the UK version depicted on this site, I received a german version, with german manuals and discs. Also, for Mac, the game uses something called "Game Ranger" which seems very old and outdated, so you can't play with friends who has the game on PC which use GameSpy.
Summary: I am always happy to have a good game for the mac. I have played similar advanced FPS like doom, prey and bioshock before but none of them offer the vast range in pretty much everything plus a bewildering complexity and I haven't even tried the team mode yet.
Summary: Superb, this is the best game I have purchased for my MacBook Pro (2.66Ghz, 4GB 1067MHz DDR3) and it runs without any issues. The game is HUGE (I haven't even begun to explore the GOTY extras yet) and very engrossing and a good mix of FPS, role playing etc.