i had it at one point for my ps2- i got it from a friend, beat it, then gave it back
i do have to say that the game is pretty good
the whole game keeps you on your toes since it is all action- there are no level breaks except when you go to different sections so the game can load
it plays just like the original, except a little faster and smoother and better graphics
the georama system is also tweaked and more of everything can be destoryed and you can now make even longer tunnels if need be
i havent played it on the gc yet, but i would expect slightly better graphics and frame rate on the gc than the ps2
also i like the gc controller better for fps games
but on a whole i thought the game was pretty good and fun to play
also it has good multiplayer with bots and all- not as good as timesplitters 2 multi but still worth it