I have never been able to hear much or any difference when trying different types of Ethernet or USB "decrapifiers" but I do like what the Singxer SU-6 DDC does for my system. I originally tried it so that I would not be limited to the USB only output from my Sonore Signature Rendu SE Optical streamer, and so that I could run outputs into two different DACs I am currently using without having to move wires.
I was pleasantly surprised to perceive subtle sonic improvements in smoothness, body, and coherence compared to using the USB output directly from the Sig Rendu SE into my DAC. Of course, the sonic differences may be partially or wholly related to using a different digital input into my DAC, but the DDC does offer isolation of the USB signal and reclocking so that may also be contributing. It is nice when you do something that improves the sound without costing a fortune.