I'd add only that my experience has been just like fred von lohmann's - perfectly acceptable sound, much better than the built-in computer audio hardware. there was a faint hissing in some recordings over the USB connections, but changing to a better USB cable seems to have banished that. the USB-in was one of the reasons for me to buy the RR2150. I'm still trying to find a good tubed DAC to feed computer audio into a nice system, since I am not about to sink serious money into a universal player when I have several devices in the house that can play anything already. but until then, I am quite happy with using computers as transports.