Wow! I'm jealous. Seriously. I had one and then sold it for a Steve Morse head. Unfortunately, the Steve Morse head was phenomenal but I couldn't dial in the high mids that I wanted. Basically, I was trying to kind of get it to sound kind of like a Marshall, but the Invader is much better at that kind of thing. Unfortunately, some financial issues came up after I sold the Morse head and my plans for an Invader fell through.
I ended up getting an Engl Raider which, if you love the Powerball II, you will crap your pants when you play the Raider. I strongly suggest checking it out if you want a versatile, loud 1x12 that can also be played at home.
I recorded a couple of audio samples of my Powerball II. They were totally improvised but I think you can hear that it's quite versatile considering that it's widely considered a metal amp. Like I said, totally improvised, and I've improved since then.
Here we go. Powerball II:
Metal rhythm & lead
Clean rhythm & driven lead