After playing through the demo I kind of feel the whole brave break thing is ridiculously powerful. The amount of damage you can do afterward is ridiculous compared to your regular attacks.
In many of the stages where I was losing I found I just had to keep using brave damage attacks, not do a single point of hp damage, and just wait for an EX transformation to pop up. From there just a simple break and attack+limit usually drains all of the opponents hp, or close to it.
Seems kind of broken to me.