Since I don't own a flashcard and I don't intend getting one I updated.
I live in Europe.
The new features are neat, but I won't buy the new Wii Plaza games because I don't care about them. Well, maybe Mansion, that sounds fun.
I had ONE crash in the plaza when I tried to access the shop and the crash returned me to my System Menu. It fucked up my placement of my games and folders, something my OCD didn't like, but nothng spectacular, really. So far I have yet to experience another crash.
Also, the Notifications said we got a new Puzzle. I got New Super Mario Bros U, not sure if the others (Xenoblade, Princess and Skyward Sword) also make it to us. Would be cool though
Edit: My fiancee has her own 3DS and she recieved a Princesses Puzzle, so it is save to assume that we also got the Xenoblade and Skyward Sword ones
