There’s the Nanoflux and a Nanoflux NCF.
If you’re asking about the regular Nanoflux, it’s a powerful, full sounding cable, that can give you the impression that you are adding a lower octave to your gear. It’s a fun sounding cable but as my system improved, it wasn’t refined enough.
Since it was released many years ago, I’ve experienced higher performing cables. I think the original Nanoflux is worth half it’s original asking price these days. It’s no longer competitive at its msrp, in my opinion.
I think the Audioquest Hurricane sounds like a lightweight Nanoflux and I compared both but preferred my Nanoflux. Nanoflux cable is a full, weighty, sounding cable but it is not state of the art with regard to focus and black backgrounds.
The Furutech Nanoflux NCF is also a very good power cable. It’s hard to describe outside of the context of other cables one uses as well as the type of outlet and if one is using an audiophile outlet with a particular metal plating.
For me, the Nanoflux to me sounds best into a copper outlet without rhodium or silver plating. I’m using a Cryo’d Hubbell so it’s unplated brass which means up to 90% copper (I don’t know specifically). But if one likes a faster sound and has plated outlets, the Nanoflux can deliver a very fast yet natural sound.
Implementation of the NCF connectors likely contributes to tight, punchy bass regardless of ancillary components.
Focus and black backgrounds are much improved in the NCF version. The NCF version is not as warm and is more transparent.
So the original Nanoflux is a more forgiving sounding cable, while the NCF version is more demanding of your other gear but can deliver higher performance.