I have a DSTT card with the EZFlash 3 in 1. It works fine. You need a file called GBAEXLoader. All you do is copy this to your DSTT. Put your GBA games (or whatever), in a folder. Than, to play the games, just select GBA_EXploader.nds. It will take you to a new menu where you can select whether to load the game into PSRAM (quicker), or load into NOR memory. That's it! Also works for the OperaDS browser. Unfortunately, the browser itself isn't very good and not something I can see myself using, but it does work. The rumble pack also works (I tried it with Metroid Prime Pinball). Didn't like it and never used it again, but it definitely worked.