I wouldn't doubt that the plenum version sounds different from standard Heliax. And it is always a question of system synergy, taste, whatever.
But I'm out due to the mechanical issues. Not user friendly. These days, I'm happy with 2 cond Belden or whatever is easy.
I'm also put off by aluminum but I recognize that this is due to some mental picture, not experience based research and testing.
I found that, especially for interconnects but speaker cables too, wires with hard plastic sounded hard and wires with soft plastic sounded soft. Got to really like PE, foamed or low density solid and soft outer jackets, even PVC.
For example,I tried many LMR series cables. Found these sounded a lot better stripped out of the hard outer jacket.
The Aircell 7 and Rg-223 I like both have soft PVC jackets, which helps with damping (or something). They also have a lot of copper inside. and I think the dual shield on these also helps with damping.
What constitutes "editorializing" is an open question. The sort of dry-ass sound that is typically lauded as "neutral" is editorializing to me! Semantics. Language. Can't let that get into the way of good music.
Used surplus Belden....now there is a neutral wire, neutral in the sense that nobody cares.
I also really like the WE 16ga AIW wire (tinned/PVC/cloth outer) that has been hipster trendy lately. I got turned on to this stuff the top WE guys in Japan 10-15 years ago. This wire is the reference for the folks at Tube Kingdom magazine. For the kind of speakers I use, that stuff seems to get out of the way, so to speak.
For horns and WE/Altec speakers, I like tinned. I used to use the WE/AIW wire a lot when it was dirt cheap. Now they sell it by the inch.
I think PVC is due for a come back. Teflon never convinced me.