i have tried lan cleansing using network acoustics passive eno, etherregen, and etherregen via optical (via its sfp port into a optical rendu)
in my system, all three sound excellent, give the music a purity and relaxedness otherwise not obtained... but try as i might in comparing, i can not honestly say one of the three sound better than the others, but all were noticeably better than no cleansing at all - maybe it is my home (a recently built one), my service area, my internet vendor's equipment that makes my situation less demanding of these cleansers, i don't know...
i would say (and have said elsewhere) that when using optical modules and fmc’s to cleanse a network feed for audio, the quality of the modules, the fmc’s and power supply are all very important in achieving the desired, positive effect