Micro SD card class?

Been using Acekard 2i for quite while now and have an 8GB Sandisk Micro SD card - class 4 and I'm gonna buy a new Acekard to give to my friend with my SD card as I'm gonna buy a 16GB Micro SD card. Only thing is I can only find one 16GB card at a class 4 as the rest are class 2 and the class 4 one looks dodgy to me for some reason.My question is, is there any real difference if I get a class 2 one? Will it run slower? Will some things not work? I still want to stay with a Sandisk unless there really is a better make that I can get for a reasonable price that's just as good or better for a class 4Cheers, -Kra-

I don't think there's much difference except speed and stuff.
It will be slower, but slightly.
It will work basically the same.I would stay with Sandisk.

Kingston are also a reliable brand. I think some games need a reasonably fast read speed (Castlevania: Portrait of Ruin does or it'll keep crashing) but I think class 2 should work.