Yeah, it is definitely very, very noticeable. Prior to the Phoenix I had the Uptone Audio ISO Regen with the LPS. It blew me away. I did not expect the ISO Regen to sound so good. Once the Phoenix came out, I knew I wanted it, so I bought it blind. The ISO Regen was great, but the Phoenix USB is better. No regrets at all.
I own the EtherRegen now, which I think brings an increase in quality. I listen to mostly local albums, using an Innuos Zenith mk 3 to Phoenix to mDAVE. I find local files to sound a bit better. The EtherRegen helps, but it’s not completely up to par. Perhaps the PhoenixNet would help further, but I have other components I want to get first. The PhoenixNet I think would be subtle and something one should get at the end of their “end game” journey. Side note: I don’t think an end game exists, though