Vetnik: Which driver verison? Because I have dealt directly with Marcos via emials and they acknowledge that the driver is NOT bit perfect, it drops the LSB. Now the new beta driver for Snow Leopard according to Marcos has solved that problem, also they are working on the new driver for 10.5.X to solve the acknowledged pop/clicks.
No need to shout, I don't think I chimed in on whether or not the Hiface is async or not. My MSB renders that moot as it discards the incoming clock, buffers the data and uses its own clocking scheme to the dac, much like any good memory player.
Either way asynch or not, it sounds FAR better than any usb to dac direct connection I have tried...dropped bit and all, so I can only imagine what it will sound like with the corrected driver.