Unless you need to run it in an unmodified 3DS or you want to use one of the emulators that take advantage of the DSTWO processor I'd rather get an Acekard 2i, which is a much better card overall, in my honest opinion. With AKAIO as firmware it should run nearly every game without patching, it has a much better menu, uses less power and it's only half the price of the DSTWO. And, well, it's still available.
Supercard was active for a very long time and they had stellar support for their products for most of that time, but I haven't seen anything new from them since they released their Gateway clone DSTWO version. Which would be as useless as the Gateway nowadays, apart from its DS functions.