So I'm confused between the Fireball 100 & the Extreme Aggression.
Don't have the chance of trying them at the moment, can anyone share their ideas or review about this?
***I'm aware it's a bit more expensive and it's designed for milles specs, extensive details on sound would be appreciated.
Neither. There are very few modern ENGLs worth owning. The only ones that aren't retardedly compressed and fluid are the Savage and the Blackmore. The E530 is also a sick preamp. I've had the Blackmore and the E530 and they are both great pieces of gear.
I'm a huge Kreator fan, and I consider myself an ENGL fan (soundwise at least) as well, but I played the Mille sig amp in a shop and it sucked.
Fireballs/Powerballs/Invaders all blow. Wouldn't seriously consider any of them. Also, modern ENGLs aren't very well made, I would spend my money elsewhere if I were you. ENGLs are the most gratifying amps for low volume bedroom playing ever created. But they won't do your playing any favors and I don't like the response on them.