I have seen and heard these cables at shows in unfamiliar systems.
Valin did a full review last year in TAS.
There have been a few cable companies that have recently developed very
elaborate and complicated cabling products with also sorts of boxes, active components
and so called "tunnels", "cells", and "interfaces".
One way to know that an audio vendor is BS'ing you is when they use words like "quantum" in their marketing material. Another is when they promise "improved clarity" but fail to offer even rudimentary performance data showing what specifically is improved.
I auditioned these a few years ago, and found they made a significant and beneficial improvement in my system.
At the time, I was using inexpensive speaker cable, so that may have tilted the results some. I still have them in my system and feel they were well worth the cost.
I have tried them including their speaker cells. They do do something to the overall sound whether you like it or not is another matter. I've found them to round off the sound too much which at first sounds pleasant but when you take them out you realise what they are doing and missing.
I did not keep them because I'm already using top cables.