I can tell you're passionate about this issue, so I don't want to fire you up, but... what is the benefit in that? I honestly can't think of a reason I'd want my strings at different heights at the nut - am I missing something?
it's a nut, won't make a world of difference, only on open strings. I guess they'll be richer in the upper harmonics, slightly. I buy it because my JANII is broken and it looks way too cool.
I'm wondering that part myself...
:/ I disagree somehow... The moment you fret the string the nut is not / significantly less involved to any vibration. That's what my understanding of simple physics tell me - but I'd be happy somebody cleared it up. Maybe with a little bit of more elaborate physics.
If you think about it, the nut is the other contact point of the string besides the bridge (besides the 2 points that actually hold the strings in place - the string retainer & tuners). The bass resonates differently with a different nut material because one of the contact points is a piece of bone instead of a piece of brass - simple physics. .