I've had a Japanese-made Fender '62 Reissue Precision bass for 20-odd years. Japanese Fenders are great instruments, but often let down (on purpose, allegedly, so they don't make US Fenders look bad) by having inferior pickups and electrics installed. So, a few months back, I upgraded mine with a vintage-style tone-harness (Emerson Custom), and one of these pickups.
And the bass now sounds exactly the way it should. The sound quality has improved markedly, the balance of frequencies is just right, the dynamics and responsiveness are great, it's easy to dial in whatever flavours of classic Precision tone you want (whether it's Motown, heavy rock or something else entirely - you can get a tremendous Stranglers sound with new strings on the bass, for example...), and it sits great in the mix every time.
Overall it's turned a decent/affordable type of bass into a seriously useful instrument. In fact, when I'm recording there's usually a Rickenbacker 4003 and a nice G&L L-2000 around, and I tend to try them first. But I end up going with the Precision anyway because it's the one that just works...