To come back to this discussion, I'm auditioning a D3 PowerSwitch with D3 Digitalz Ethernet cable. I can only echo what other wrote. The impact is subtile, yet significant. More depth, a wider sound stage, a better defined low, less smearing and more details. A D-TC3 Supreme is out of budget, so will not even try it

The D# will probably not leave my listing room anymore ....
Still using an AfterDark optical isolation/media converter for optical isolation with Finisar SFP+ modules.
@cykin , is it worth to replace this by a Edis Creatiion Fibre Box II. These are different techniques I guess, but am wondering what such a Fibre Box would differ from an audio grade media converter.