Interesting. For what it's worth and this is just another subjective and system-dependent view, I recently auditioned a pair of the new TA Opus power cables. In short I didn't get on with them.
I had thought that given my system is pretty much TA loom throughout (Ref XL Gen 5 speaker cables, and Ref XL digital cables) that there might be a nice synergy thing.
Instead I lost a lot of bottom end poise (sorry not a great description but that is the best way I can think of describing it), despite the impression that the soundstage had opened up a little, an effect that wasn't unpleasant at first.
So I stayed with my trusted Entreq Atlantis mains cables, which just seemed calmer and better grounded (pun not intended!!) with much better textured bass. But it was the poise that really jumped out at me. I am yet to find a mains cable that comes close to it, mind you I haven't tried that many!
Guillaume