Well in June I bought what seemed like a great deal, 4x 32gb MicroSD cards, for $83 .. less than $21 a card. On Groupon, so thought it would be fairly reliable....

Took a long time to come, there was a five week ship time, but further delays...
Eventually got my four 32gb class 10 cards... and they are fakes.

More like class 4 speed, and only the first 2gb data writes then you don't get anything more on to it, fake controller reports 30gb to the OS. A bit of forensics and there's really only 2gb there. Partition applications aren't necessarily fooled, one case i could only make a 2gb partition - it spotted the fake.

diganostics from H2testw:
The media is likely to be defective.
1.8 GByte OK (3780375 sectors)
28.8 GByte DATA LOST (60408041 sectors)
Details:14.1 MByte overwritten (28905 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
28.7 GByte corrupted (60379136 sectors)
14.1 MByte aliased memory (28905 sectors)
First error at offset: 0x00000000735e2e00
Expected: 0x00000000735e2e00
Found: 0x41a33f29c0b9ffb7
H2testw version 1.3
Writing speed: 10.6 MByte/s
Reading speed: 14.2 MByte/s
H2testw v1.4
Damn it

It was on Groupon.co.nz and the vendor was BuyNowDirect (in aus)

Know at least one other person who got suckered with these. Must be thousands of people around the country and I bet a few on geekzone here??

Have written emails to both groupon and buynow we'll see what happens.