I've had trouble finding reviews specifically on the djc 4, myself. Good stuff is spoken of the punch and tight lows/mids of the delano jc4's, so I did just this Saturday finally order the djc4 for my precision lyte deluxe. The old electronics/and or pickups were getting distortiony and unpredictable so I gutted the bass to go passive with all new components (after a professional rewiring job didn't resolve it).
I've had a bartolini 8s in the neck for a year. Bart doesn't make any in the dual J shape so I searched around and found Novak, rio grande, sgd, and Delano all do. There's a good chance my MIA sgd order from November might show up by the time BBG gets the Delano to me, so it should be some fun experimenting between the two. Hoping either of them matches well with the Bart P pickup. I'm also planning a 2 or 3 way switch for fooling around with the Delano's coils.
Findings to be posted pending pickup install, kind fellows.