- no wiring, unless you buy a prewired set/harness that some vendors might offer
- none - gotta buy everything separate
- seems to be more or less the same thing
If you are going from active pickups to passive - yes, it is a pain switching all the hardware, wiring it all AND grounding it all (don't forget about that!). It's one of the reasons I've decided I'll stick with my EMGs and not go for the new Black Hawk.