This unit was fine when it was new, but in a few months, output from SPDIF (optical jack) as well as from the RCA jacks became noisy.I have never been able to make the SPDIF input work.It gets one star for the few weeks it partially worked when it was new.If all you want is to get audio into your PC/Mac, try Griffin Technology products like the iMic, or for 5.1 Surround sound output, the FireWave.This ADS unit was a nice idea but really didn't deliver for me. I consider it not worth even the price of shipping, let alone the actual cost.