I used to own a beautiful fireglo '70s 4001. Beautiful to look at that is.
I battled and fought that thing for 5 years, had it set up professionally twice (yes by techs who knew how to adjust the trussrods correctly) before I finally had to admit to myself that it was an awful sounding and playing pile of crap of a thing.
To this day it's the only one I've ever played but I know that some people love theirs dearly so I just got unlucky with a bum one it seems, so because of this I'm just not down with the boutique-like reverence that some people hold them in.
Although one day if ever I have the funds, a 4001V64 is out there with my name on it.