I have to jump in this on too, not has someone whos knows anything about them, though, sorry.

. Ive been looking at these too. havent played on one yet. But, they look good. I was reading about them on Ampegs site, They had the 2x12 and 2x10, both 4ohms, I forget the watt handleing, but, I remeber it was plently for me, I have a Ampeg svt, 2 channels @200 watts at 4ohms each. So, the portacab (if they sound good) would be perfect.
I know I hate luggin around a very heavy and awkward to carry 4x10 cab, and , Im guessing the other band members dont like it either.