I got a DSTT for my girlfriend to try out (I have 2x CycloDS, which I recommend) and it does everything she expects of a Slot-1 card. She doesnt care about extra bullshit like realtime save, custom skins, slow motion, blah blah.
Shes only had a couple games crash on her using a Taiwanese MicroSD card, but it was basically because she was button mashing and the game locked up. Whenever she reloaded after crashing and didnt button mash, it didn't freeze/lock-up. It was definitely good value for what you get, the card is solidly made and its easy to use. It bothers me that you can't sort games alphabetically or otherwise...they are all displayed by when you added a rom to the cartridge (this doesnt bother her in the slightest tho.)