I got these to replace a Seymour Duncan SPB-1 in a really nice MIJ Fender Precision. I never really connected with the SPB-1. I found it a bit too relaxed/scooped in the mids, the output was on the low side and it didn't snarl the way I expect from a vintage P-bass when digging in.
So I got the Fender CS62 instead.
Pros:
-The sound is great! Personally I prefer the slightly more aggressive/forward sounding Fender Originals but that's just a matter of taste. Of all the currently available Fender P-bass pickups I think this CS62 is the one that best nails the early/mid 60s sound.
Cons:
-The construction is disappointing. Quality control must have slipped at Fender (again!). The pole pieces are supposed to sit flush with the cover on these pickups. Well they're not. The pole pieces are protruding 1-2mm out of the covers. Which makes it easier to hit them with the strings and get that nasty crackle when digging in hard close to the neck. It's not a big problem in most situations but sadly it is an indication that quality control is still a problem at Fender USA.
-I also find Fender's gimmicky marketing for their pickups to be totally ridiculous. They've currently got three pickups that they all claim is a faithful reproduction of the early 60s P-bass sound: The Originals, the Pure Vintage 63 and these Custom Shop 62. Come on Fender, can't you at least try to describe how these three COMPLETELY DIFFERENT pickups actually sound? Personally I love the Original and this CS62 but I'm not a huge fan of the much mellower PV63. Simply calling them all a faithful reproduction of the 60s sound is misleading in my opinion.
Still, if we're speaking strictly about sound quality I see no reason to pay more for boutique offerings. These Fender pickups sound just as good as anything out there if you want the classic, vintage P-bass tone. But be aware that these pickups are mass manufactured and there's a chance you may get a bad one, something that would probably not happen from a boutique manufacturer.
I'm both slightly disappointed and really happy with these pickups. I'm giving them top rating for sound and not so great for the rest.