I have a 2008 Supreme, it's pretty awesome sounding and great sustain due to the chambered body. They are cake to change pickups or anything in. Yes you access the wiring through the jack plate. No rear covers on them at all. I have a Roland GK1 on mine for tinkering with some MIDI things. I like the supreme over the chambered les pauls by a mile, it's much better sounding IMO. I bought mine in 2008 when it was few weeks old, If I remember right I paid around $3500 for it off Sweetwater.