I have a model 2, model 6, and 550xl. The model 5 and 6 does not have active pickups, they have a mid boost circuit. I replaced the bridge pu with a Seymour Duncan Screamin Demon Trembucker and left the mid boost in. I did buy a battery box so I can change the battery without removing the cover. I have the JT-6 on both the 2 and 5, they are decent tremolo's. The model 5 and 6 are great guitars and really underrated and good buys.