I don't know what my micro-card is but it came with the machine (CR-10) and has been working fine for not quite a year, and even though it gets a lot of use I really don't expect it to give me problems at this stage. I don't mind working with these small cards though.
I also don't like to keep the card full with things made and only keep repeatable on it, in their own folder. Everything else goes onto the computer in a Printed folder.
It's more a management thing than a problem with cards really.

I think the problem the OP had was with operation rather than a dodgy card. I was there myself