DSTWO is by far the best DS flashcart so I'm not sure what all the complaining is about. It won't be perfect or the price tag will be through the roof. If it were easy to program an SNES emulator fo the DS then it would have been done by now, but obviously it's not because no one has successfully created a fully-playable one.
And to those complaining of a lack of updates? I don't know what world you're living in but the Supercard team is generally the FIRST to respond. If there is a firmware update to the 3DS, the SC team generally has an update the same day or next day. The last several times they were FIRST to address the firmware update issues.
Furthermore, they release patches all the time to increase compatibility with new games like Pokemon White/Black 2 etc. so we don't have to worry about patching games ourselves. We can keep our nice clean ROM sets in order.
They also release those updates extremely promptly.
So what are you complaining about? DS compatibility is damn-near 100%. I personally haven't found a game that didn't work. Real-time saving and cheating works perfectly. There are multiple save slots.
Also keep in mind that (with the exception of the GBA/SNES emulators) all of the emulators and homebrew are created by people OTHER THAN the SC team. In my experience the GBA emu works great while the SNES definitely needs some work. But hopefully you KNEW that before buying it if you do your homework. I sure hope you didn't buy it just to play SNES games...and if you did, that sucks, but try downloading the TG-16 emu and play some *amazing* games from the same era. That emulator is fantastic.
But in the end the card is for DS games and the DSTWO is more than adequate with a plethora of features that other cards don't have.
Long story short - the SC card DOES update the SC DSTWO and they do it PROMPTLY. So where does this lie come from?
As I've said before, if you're main goal is emulation and you want to play on a handheld, BUY A DAMN PSP.