I can also confirm a working 2GB Ridata 150x SD working ok on my jasjar.
Had to reformat it on a pc the first time, tough, because straigth from the packaging, i only read 1gb capacity in the jasjar.
After formating, all's well!
Still, i didn't saw almost any speed increase...
I know that the device itself probably doesnt get to the top speed of the card, but...
Anyone else could post their toughts on what (if any) speed increases they had on their devices, as well as the cards brands and sizes?