I used this Pickup to replace the stock pickups in my mexican fender precision bass. Replacing them was farely easy, remove the pickguard and the old pickups, solder them in, adjust the height and put the pickguard back in place, that is it.
I give the sound 3 stars because it's not a real improvement to the old ones. Nevertheless, the quarterpound delivers what it promisses. Heavy bottoms, singing mids and (if you really crank them up) defined hi's.
It probably comes down to my bass, which is not really a hight quality product and is thus not able to really support the pickup, maybe this thing would work better in a American Performer (or something in that range).