Chatting with one of the guys at my LGS about reloading and were talking about hard media media vs ultrasonic liquid ones.
He reckoned that the downside to solid media was you get bits stuck in the primer hole that you have to flick out, but said you can tumble your brass before taking the primer out so this doesn't happen.
Surely if you never tumble your primer pocket though it fills with crap and wears out 10x as fast?