Interesting.
But some equally interesting claims.
1. 'Lowest possible action. It's simply another fret. You can't get lower than that.'
Want a lower action, cut your conventional nut lower.
2. 'Best playability because of lowest possible action.'
See number 1.
3. 'Best tuning stability.'
Harder conventional nuts will give the same tuning stability.
4a.'Open string tone more like fretted tone.'
See number 3.
4b. 'More articulate.'
Articulation is not a function of nut material. It is much more dependent upon technique.
5. 'There's not a single thing you can do to your guitar that's gonna make it feel better and play better than the ZeroGlide System, period.'
That's just an unbelievable whopper....
I'm sure there will be guys, even famous, talented guys, who think this is the best thing to ever happen to guitars.
Me - I'd just rather have a nice, conventional PTC setup done.