I first chance I had to play it on a live and loud was an outdoor Zeppelin gig, and oh my, it certainly sounded huge and full! I actually had to hold back a bit; compared to my normal Jazz-hybrid bass that I use for Zep (with Fender Deluxe active pickups and electronics) this thing sounded WAY bigger. I have to say I was pretty blown away - I did not expect the fullness with such a light body (it's not Ash or Alder, I think it's Paulina or some other Pine-like wood). What I did notice, however, was something weird in the E string, which I confirmed at my next two Zep gigs - except for the open string, there was some weird doubling going on, and the intonation on the E way way off, with each higher note more out of tune (songs that stayed in first position were great, songs higher up - like Dazed and Confused - sounded very dazed and very confused).
I just assumed there was problem with the neck, and planned on replacing it with a better one I have used for years on another Jazz bass. But as I thought about it more, I decided to try a few other tweeks before I gave up on the neck: