On the other hand, I have owned the original ENO & MUON. Both of which made a noticeable & positive improvement to my streaming. I now own the MUON Pro Streaming system and even with optical isolation, I find the MUON Pro & Pro Ethernet cable to be a very worthwhile addition. More natural, relaxed without sacrificing detail. Music has more body. Any thinness that some find with optical is no longer. I have placed it just before the Gold Note Integrated. MUON Pro Ethernet cable from SR switch to the filter, the attached pigtail plugs into the integrated. I have found Network Acoustic to be honest, responsive & dedicated to bringing excellent products to market that absolutely deliver on their promise. They also offer a generous money back trial period. Of course, everything is system dependent.