I've been using the Furutech IEC rhodium for a month and I think it works fine. It replaced the Wattgate 350 that came with the Valhalla and I do not hear any difference in SQ.
Spiral Groove/Soundsmith - jRiver/Audiophile Optimizer/Process Lasso - Devialet 1000 pro - Rockport Ankaa
Nordost Valhalla, Brahma, Frey2+ & Tyr2/Ansuz Mainz C/D8
Nordost Valhalla, Brahma, Frey2+ & Tyr2/Ansuz Mainz C/D8
Isoacoustics OREA/Shunyata Dark Field/Nordost QV/QK
Devialet Gemini