I never had any problems with the supercard ds1, since i own it. (early january)
I always use it the following way:
-download rom
-look up savegame size on wiki.scorpei
(takes about ten seconds, while i download the rom)
-copy rom to microsd
-change savegame size
(i can live fine with that inconvience compared to the cheap/ugly interface of r4/m3)
-play
Never failed and i played most games (EU & US) which got released since i got my supercard ds1.
(the problems with castlevania por occured on many different flashcarts randomly, so no supercard fault)
I admit that the supercard team doesnt release very much updates or support.
But to be honest, why would i need any updates.
Everything works fine so far as long as you are capable of looking up and changing the savegame size youself.
If you have problems with the supercard its because you have a cheap noname microsd, you are too stupid to change the savegame size or you are just a plain dumb supercard hater who doesnt own one, but still flames about it.
yours,
some Supercard lover