I have posted my experiences on other posts. I was originally running the USB directly from modified Mac Mini to USB input to K-03. After a couple of months of listening, I decided to install the BelCanto RefLink USB Converter. USB from K-03 to BelCanto RefLink and SPDIF out to K-03. Everything improved (Width of sound stage, improvements in Micro/Macro Transients - just removed additional digital artifact to bring me closer to hearing whatever I throw at it.
That said, when playing back the same CD's in the K-03 transport, it is still superior to playing through my computer based rig. I still listen to music mostly using the computer mainly for convenience sake. I would recommend getting a demo unit (BelCanto RefLink) for a trial. My experience is that it will allow you to get the most out of your K-03 or K-01 for the price we often invest in power and interconnect cabling.
That said, when playing back the same CD's in the K-03 transport, it is still superior to playing through my computer based rig. I still listen to music mostly using the computer mainly for convenience sake. I would recommend getting a demo unit (BelCanto RefLink) for a trial. My experience is that it will allow you to get the most out of your K-03 or K-01 for the price we often invest in power and interconnect cabling.