The clones (gold dot) work fine with DSTT OS 1.15 (the current one).
The only issue is that the DSTT team have threatened to make the next version of the OS either incompatible with the clones, or even 'burn' the MicroSD.
I would think the best they could do is to corrupt the card.
DSTT OS 1.15 has better compatibility than the most recent R4 OS, so theres not really any reason to choose a more expensive R4 clone over even a fake DSTT.
You can get the real DSTTs (in the new plastic packaging, not the box) from Dealextreme for $12 once they are back in stock in a few days. The ones in the boxes are clones.
I have 2 fakes and 1 real DSTT, all work great.