Well, I've had the same kit installed in the same guitar for 4 years, and it's always worked perfectly, but I didnt like the way the pick up that came with the kit sounded, so I replaced it with a NB and now it's the other way around! I like its sound, but the sustainer sounds terrible. I dont know how it's wired, but the guy who installed the new pick up is the same guy who installed the sustainer back then, so I guess he just swapped the wires..