If the SD reader in your console breaks, it's going to be as good as a brick. With this, you can keep using your console.
Yeah, and if I drop my 3DS in water it wont be any good either. Not gonna live in fear of something that almost definitely wont happen. I keep good care of my 3DS, this shadownand is simply useless to me. Though I'm sure there are some people that don't take good enough care of their device where something like this could possibly be useful, again though, not me.
Also, as someone pointed out a page back: Without an SD card, it'll give an error message if there is no a9lh.bin found. That's it. That is all it will do. You wont be able to actually play anything on your 3DS, it will just inform you that your SD card isn't inserted. So yeah, a busted SD reader with or without Shadownand still wont work properly. Shadownand will just give you a message while standard A9LH wont display anything. Woop dee doo.