It all depends on what you're fighting. It has a bleeding affect. Edges can be taken the up the damage and bleeding success. It almost never fails. An especially good cross will prevent your foe from getting any attacks for a round. Take into account your foe's weapon type and your skill with riposte to decide if it is the best skill to use. It's also blunt damage and is by far the best thing to do against gnomes when you have the edges.

Cross is nice...but it's no leverage.