Yep, seen both of these in reviews. The Fireball sounds more bassy. The Ironball sounds a little high-passed. Which I suppose is probably what you want for 8 string type players to get rid of mud. The Ironball also has the SE model with a million switches and features. I suppose if they are set-and-forget then that could be a good thing.
Both of them have a slightly strange dark sound, like they were low passed to get rid of fizz. Is that a thing with Engl amps? If so I applaud the dedication to ultra high gain and the things one needs to do to make it work. What do metal players think of Engl in general, are they happy to plug into one if they see it or is it a preference thing, like, I don’t like the Engl sound, etc.