I helped @0ni at CAPO nats and would never enter a CAPO meet, the head judge was calling squat depth from the front, that's enough for me.
GPC judging at the national level is very good, probably a little more consistent than P.A, though P.A is very strict especially on squat depth, i've noticed that unless you bury it you risk reds from the side judges.
Typically GPC meets have loud music, and compared to the 1 PA meet i've been too typically a much better atmosphere, the music doesn't stop for lifts and you don't get teeny bopper music played. When Adam Coe is announcing it's amazing.