My JC NBD was a couple of weeks ago. Daily home practice and two band rehearsals proved to me that the bass really "is all that".
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I play it on my hip with the neck angled exactly like Jack does. Fortunately it wasn't a change for me as I've been playing/gigging an ABG for the past five years in the exact same body and neck position.
Also a non adjustment for me was the body size and neck thickness. My ABG body is even bigger and the neck fatter so the JC seems slim and trim.
I knew this bass was capable of a wide range of tones and, well, it IS. A seriously versatile bass.
IME there is considerable neck dive but it's easily remedied by using a wide, suede or similar backed strap. My ABG had neck dive and that kind of strap solved it. Works the same on the JC. (Ultralight tuners will help and I may go that route too but they cost $100 + per set.) I tried the poly webbing strap from my SDGR SR800 to see what would happen and it was like the headstock jumping off a 20 meter platform.
I'm 6' tall and need a minimum 56" strap to put the JC in the correct playing position. As I mentioned above a suede or other rough backing is necessary to counteract neck dive. I use a 2.5" Franklin Original Suede strap. Reasonably priced and very comfortable.
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Edit: I thought I would also mention the strings I use if anyone is interested.
GHS Brite Flats in medium light (52-103). They are actually ground/half rounds that are well balanced with a flat feel but nice presence and sustain. Jack uses Med. Lt. Dean Markley Blue Steels. Those were my go-to stings for many, many years until I returned to my roots with flats. the GHS BFs pair very well with the Jack bass.