The flash memory scam isn't just related to it stopping filling up when 8GB is reached instead of 32GB. The first (and only*) time I was hit by it, many years ago was that after xGB is written it quietly starts reusing blocks that have already been written. So you now think you have written x+1GB. When you go to review your pictures or upload them you suddenly realise all the older pictures are corrupt and can't be read - and you've lost them for good.
Quite clever the way they reprogram the controller chips on the cards, but a right pain.
*After that incident I discovered h2testw and test all cards now.