Mine was a SanDisk too. Weird. At least it fixed the problem I had using the Twilight Hack.
(Couldn't get it to work on my old SD, but this MicroSD in the adapter works.
)
EDIT: My M3 DS Real just arrived in the mail! I went out to check my mailbox just in case it was there... AND IT WAS! Everything went very well, only complaint I have is the problem with getting the MicroSD in and out of the M3. Another oddity, was that it had the M3 Sakura logo on the box. Not sure why.
So, I've now entered the world of M3 DS Real. Thanks everyone!