Well, I know Sony don't suppot Vista x64 officially but it does work, and it works very well apart from the speed it takes to transfer ATRAC files to device. To move a 100mb ATRAC file you are looking at about 10 mins. I have USB 2 and moving stuff to USB pens is fine but SS 4.3 is sooooooo slow. Anyone esle out there with same issues? Is it because I am using Vista x64? Oh, I am using a Sony NW-A808