I got the original SD version of the Supercard, and I haven't had a problem with it yet. I'd throw my support towards the Supercard myself.
You will need a Superkey or something that does the same thing to get it to boot, at least the first time. If you want, you can install FlashMe on your DS, elliminating that need in the future.
Also, its interesting to note (I just looked on the DS-Link website) that you need to use FlashMe on your DS before the DS-Link works completely. I'm not exactly sure how one would go about that with the DS-Link in the card slot, since you pretty much need a PassMe (or Superkey, etc) type device to do it.
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