I just swapped my veritable Cisco 2960 switch for an Etherregen.
Straight out of the box there was an improvement in the higher frequencies with more clarity, more reality, although loss in bass volume.
One week later the soundstage is wider and deeper and the bass register clearer. This is a significant upgrade on the Cisco
I found that the Etherregen with the standard switch power supply to be power sensitive – better on my BMU compared to the wall, and better still with a MCRU 75 power lead compared to a standard Naim powercord
I am very tempted therefore to either buy a linear supply from Farad or Paul Hynes, or a Teddy Pardo
To my mind, for those that use streaming, getting the switch right is a logical first step before thinking of a better dac/streamer.