The initial 2 HD Power 3 sounded bad 1st 60 hours. Bass was boomy/loose, image wandering, flat soundstage and I was getting worried. I never experienced cables changing so much during break-in. After 60 hours, everything stablized and sound clearing up but I can hear it's still needs further breaking in.
I bought 2 more for my mono amps and was preparing for bad sound but it sounded very very good out of the box. Not sure if problem was poor synergy with my TRL/FIM PCs or just needs a full loom.
These cables work well with both low and high current components. Sound is detailed where I can decipher lyrics that were smeared in the past, I can hear deeper into the music, fast with good dynamics and sound stage further back then I prefer. Tone and texture are ok but hope it will improve with further breaking in.