I got my ABM 600 IV from @ern500evo last night. Got home and plugged it in. Once I'd realised that the mute button was on and and got some noise out of it, I'm well impressed. It sounds awesome and I've just got the eq set with everything at 12. It's a huge improvement over the Orange Terror I was using, much bigger sound, clearer, nicer valve drive sound. I think I might actually be able to stop using my preamp pedal that I needed to make the Orange sound acceptable.
Can't wait to get to band practice now and crank it up loud.