I had bought the 32GB card here on sale.  It ran great for the first 4 months.  This afternoon it unmounted from my Samsung SGS III.  I powered the phone down, re-seated the card, powered up and it was still not recognized. Powered back down, pulled the card and popped it into the computer and it showed a single partition of 0 bytes. Mounted the card back into the phone and booted into recovery (my phone is rooted with CWM), where I double checked that it could not be mounted or formatted. I then tried to re-partition the card but no luck. Phone is back up and running fine on a spare 8GB card so no problems there.  It doesn't matter how good or how fast the card is if it dies this quickly. I had most of my stuff backed up so no major loss, but I am out the cost of the card...