WARNING generic EVO micro SD cards are a time waster

So I got 4 of these generic Evo SD cards from Ebay. Evo is a Samsung brand by the way, and generic Evo indicates that they are the same thing but without the Samsung name. Whatever.

Anyway, out of the 4 cards 1 was good. 2 were duds immediately even though I've spent way too much time trying to format them into some useful outcome without luck. And 1 presented with needing a reformat randomly, now also in the bin.

This was a bad bargain, plus a huge waste of time! I have not intention of contacting the vendor or any more time wasting on this, but let this be my warning to you.