Played one a few times, not at war volume though, it was going through one of the GK Goldline 4x10's.
Was using a P Bass with rounds on and it sounded epic, a real nice fat bottom end with a bit of fur and that GK top end zing. I was really impressed, but saying that a friend uses one with a GK 2x12 and we were on the same bill one night, using our own gear, we sound checked with ease, they took a long time to get there. The band were complaining of some weird bass sounds on stage. The amp was new to him at the time, and he wasn't using any extreme EQ. Might just of been that cab.