So today I traded an old head I got at a garage sale and never used, for this. Never had a 6, never had an active - so I have a ton of questions. How often do you change batteries? Are the pickups any good? What do all those knobs do? Do I want an active?! What can I play with a 6? Should I keep this, or just flip it? Does anyone want it? This thing is HEAVY. Seems like when I thin my collection out, it fills itself right back up..