sorry i dont know that much about this unit in particular, i just know that the top range akm chips are the only ones that are really giving the ess chips any competition as far as specs and from all reports of them they sound really very excellent too with the right design. this wont be using their flagship 32 bit chips the AK4480, but to name a few others not mentioned here, the esoteric D-05 (and probably newer models too), slim devices transporter (and of course the modwright upgraded version) the denon sacd players etc etc, in fact i think the jh3a uses an akm.
its only going to be useful as a portable dac if you have a device that can feed it usb, such as a laptop, netbook etc, its possible it will work with the ipad via the camera connection kit and no you wont be able to connect to your dap dock connection, like the fostex (which i believe uses an akm chip too) or clas, just to get that question out of the way before you ask it =)