well, not really awesome at all :P
just two words: Added Effect
allows for the quick destruction of demons gate in under a minute:
http://www.youtube.com/watch?v=Fcn1GgcP6hc
(added effect + time)
allows for one-hit KO against some enemies:
http://www.youtube.com/watch?v=r3QYMI27hvA
(added effect + contain)
can be faster than using magic breath against a group of enemies
can be coupled with counter attack
although it's possible it may end up not being worth it (takes time to acquire the materia), i haven't finished testing against all bosses yet. so it remains to be seen if it is worth it or not.
many things are used in that demons gate battle, including the wait-trick and other subtle forms of manipulation. i don't know if you already know about those. brutalal has the memory addresses needed for demons gate manipulation, but i guess that is quite far off :P
i'll post other things at a later date