I am going to buy a DS this week, just to play the DS games, I do not care for features of the newer DS's. My question is, I am going to buy an action replay. I have had one for my Gameboy Advanced, SP, and was wondering, is it the same concept? Enter codes, enable the ones you want? Etc? Also, I have googled this and some people say that this could mess up your save file? Is this true? Or are there any other dangers in it? My GB Advanced SP never had problems.