I just replaced my RD rev II 2.5m speaker cableswith SPM, and was surprised to note improved naturalness of leading transient edges on percussion. Drums sound less "poppy". Spectral tilt seems the same. I got the SPM cheap, so it was well worth it. At 2x the RD's price, though, I'm not sure I'd recommend it. I still have 3+6m of RD XLRs between Aleph P and 2 monos, and not sure if I'll bother to chase SPM there, as the difficulty of buying/selling asymmetrical pairs, and the fact that the sound is SO GOOD now precludes being more obsessive...for now. Ha!