I bought this for a PB kit that eventually became a decent PJ bass.
I had to rout the cutout for it, so can't comment on whether it is a straight drop in replacement for a Jazz.
Out of the box, it comes across as being well-made and works as it should.
At the time, I had Elite strings on the bass and was rather disappointed with the sound of the new pickup. Then I went back to my favourite Rotosound 66's [see review] and everything changed. The pickup came alive: the harmonics were full and rich and the growl was good and strong.
I would definitely recommend this pickup to anyone who wanted to upgrade a lesser bass .. but you might want to try other strings to get the best out of it.