The main problem with this domain, as it has been pointed out, is that not famous or recognized law firm will want to be asociated with the "super" part of it -- hence it doesn't sound pro enough, it sounds redudant, etc.
If you place a keyword search in Overture, you can see the trend: divorce, bankcrupcy, criminal laywers, etc.
That being said, though, it doesn't mean it does not have any value. You might have to develop it and give it some direction.
I would say that unless someone has a very definitive idea on what to do with it, I don't see anyone paying more than mid to high $xx for it.
Good luck with it.