i've got an interact 1024 card. i personally have had no problems with it at all, i have an animal crossing save, 7 resident evil1/0 saves. ssbm, a couple of Sonic adventure 2 saves. 3 bloodrayne's, 2 mystic heroes, wind waker and bonus disk, 2 two towers saves, and tons more that i dont remember at the moment.
it has never crashed or anything like that, although it does get a bit hot occasionally. that's why i take it out when i'm not saving. and it saves a LOT faster than other mem cards do. my sisters animal crossing card goes thru that save jingle 4-9 times. mine usually cuts it off at the 1st or 2nd time. and wind waker saves instantly, it doesn't even shows the now saving screen.
i'd recommend it, but don't let it get too hot, check on it after every few saves or so.