I played a Vengence at a GC in Manchester, CT.
It sounded really good, but only to a point. When I dimed the pre and post gain on the Amp and tried using the master volume to keep the sound levels down, the amp became microphonic. It sounded like a fuzz pedal that kept farting. It was really quite a shame, because other than that, the amp sounded great!
I'd like to try the Armageddon if I get a chance to.