I can understand X for OK because that's the equivalent of the A button on other systems, but that would be weird for me. I mean, my thumb is used to going on the bottom of the four face buttons by defeault, so I'd go crazy switching it around. Same thing for certain actions in certain games. I'm used to Square (or its equivalent on another controller) and X being used for Attack and Jump in lots of games, so it feels weird whenever I play a GTA game, for example (Square for jump? WTD?). That's also why I used to have a hard time playing lots of GameCube games and, now, playing Wii games.