I tried them out a seldomly. When I got a new one I mainly just used them to see their ultimate attack. Those things were pretty useless. Being defeated by regular enemies. I didn't even try to attempt making one of my characters a summon class on my third playthrough. I don't know how awful that would've been. The game should've been more structured for making classes overall. I heard Japan got that version, but we didn't. I would have gladly paid for the game again if it meant better gameplay. I love class systems.