Firstly, I've been playing bass in rock bands for the past 5/6 years and I can easily say that this is easily my best purchase in those years.
I bought these pickups to put in a Harley Benton bass worth ¤130, as a fix up project.
Sound:
Where do I begin. These pickups offer a huge array of sounds. The neck pickup (precision) on its own offers a very Fender-esque vintage p bass sound, while also offering it's own spin.
The bridge pickup (jazz) on it's own sounds very different and quite like Jaco Pastorius, while also having it's own spin too. It's thin, but has it's own shine.
My favorite way to run these pickups in a Rock/Punk setting is with both on full and tone on full also. The sound is very full, just enough bass to keep it's presence, while also offering enough treble to cut through any wall of sound.
For a more relaxed Jazz setting I use neck pickup on full with bridge at about 2 and tone at 5. This offers a beautifully smooth sound that sustains into oblivion and drives walking bass lines.
Honestly, my Harley Benton would be horrifying without these pickups. 5 stars.