I just bought an R4 sdhc ultra? for my ndsl.
The box says R4 sdhc and revolution for yada yada
After googling I saw some website that says it's a fake (oh shit!!)
Dammit

So, is it really fake and can it be used?
I mean, what problems I might encounter while using it?
Noob in nds here T.T
thanks in advance >.<