I use codebreaker and I use three codes after beating the game without cheats. The three codes I use are: Max munny, Max Drive, and have and max all weapons and items.
When I use the max drive code in the game, it's not maxed yet. I hit an enemy once and it is automatically maxed. It replenishes BUT I can get it maxed again by just hitting an enemy once. It was a rare code to find for codebreaker, well to me.
As for the code for have and max all items and weapons, I was afraid if the game is going to freeze because of this code. The code literally lets have you ALL the items and the weapons in the game. So I figured I activated this near the final fight with Xemnas. So far I have no problems with these codes.