I just installed the iFi Silencer.
It is placed after my WW Platinum 8 Ethernet cable which comes from my modem and then is going into a Uptone Regen.
And even though from the Uptone I am running fiber to my Lumin X1, I can honestly say the iFi Silencer has provided even more dimension/depth into the soundstage. So, it must be doing something to reduce noise, etc.
The cost for these things is relatively cheap, but worth the cost.
ozzy