I bought a Super Twin, mainly because my back could no longer handle lugging my old Trace Elliott combo around, and it has just got better and better. IMHO, the best thing about this cab, is not that it sounds great, it's the fact that it cuts through guitars, drums and vocals with ease, once you get the amp settings right.
Once a year I get to play a gig with 'money no object' hire kit, and I get the Ampeg SVT / 8 X 10 rig - usually, this completely blows me away and makes me think about taking a 4th mortgage, but after playing the Super Twin for the last year, I came to the conclusion .... the BF ST is that good, it is better than the Ampeg 8 X 10 (and no, they weren't supplying free drugs as well).