remember that this device is for CHEAT porposes recomended for thoose that dont CARE if they mess their games up or need to get awkward items or Pokemon :)
or if ur stuck , just to get through to the next part of the game.
Well worth it though, for games that you've already beaten but maybe want to go through the game a lot quicker.
As in most DS games they make there are sertain items and other thing you cant get without using a system like this or going to japan for events.
used one on PS and PS2 as well as for older systems and gameboy with no ill affects except some minor glitches or corruption if you mix region codes. It shouldnt cause any damage to ur ds as its the same as a cartridge and unable to affect the Ds itself, if something stops working it will be the action replay itself. But take care when inserting and removing the card as this can sometimes damage the small readable chip just inside the ds and also make the screen flutter and distort if this happens STop using the card altogeter.
Hope this helps all those out there that were 50/50 about getting this item, now im off to buy anouther one for my bosses son for his pokemon game lol