I bought this Pickups to replace the Pickups in my Fender Jazz Bass V (MiM), because the sound of the original pickups were to vintage and didn't had the punch that i need for my taste.
The first arguement for the Seymour Duncan's is the shape. You can replace them without mill or drill of your corpus, if you have a Fender Jazz Bass. They fit very well in the original places.
The second argument is the incredible revaluation of your bass sound. They give you more crunch, growl und punch as your originals.
My hint: order them, test them, and if you don't like, just send them back!