I have had the Off-Ramp 6 XMOS USB converter in my system for a while and it sounds wonderful with 44.1 and 96 tracks, but it seemed to malfunction with 192 tracks. Turns-out that a friend brought over his XMOS USB converter because he wanted to hear it in my system and make bench measurements on it. He also brought a Singxer USB converter. The Off-Ramp 6 crushed them, but none of them would work at 192 with my DAC, so I believe the problem is my DACs S/PDIF input, not the Off-Ramp 6.
As a result, I plan to do another spin of the Off-Ramp 6 USB interface board and start production on the Off-Ramp 6. I recently got a SOtM USB regenerator and two Wireworld Platinum USB cables. This configuration now beats my best Ethernet. I would not have thought it possible, but it's even more 3D and live sounding than Ethernet, at least using Amarra for playback app. Both interfaces deliver 10psec of jitter over a 4-foot coax cable. I still have the SOtM Switch to try on my Ethernet though, so that may bring Ethernet on-par with USB.
I have updated my recommended systems on empiricalaudio.com website to include the optimum Ethernet and USB configurations and all associated products and cables, many from other companies. Check it out:http://www.empiricalaudio.com/computer-audio/recommended-systems