I've got one of those MIM 60ies reissue Js and it is a fine instrument (workmanship is good) except that unscrewing the neck for trussrod adjustment is of course a pain in the arse, but that is what makes it a reissue.
I'm fine with the pups, not much midrange to them, but that is not what I expect from a J which in that respect is a bit like a Ric, ooomp and glistening presence, but no barking P bass mids. There is no lack of warmth, however, the bass always sounds pleasant and cuts through well.
Uwe