I don't use GFs either, too much trouble when I can kick their arses myself. I do summon Eden once in awhile, Eden is my favorite. That GF can do some damage, but not much compared to Lionheart.

I am also currently in the middle of the No Junction Challange. So far I have gotten to just before the party sets out to Timber for the first time, without using or junctioning GFs...which means no items during battle either. GFs are pretty useless once you get good magic to junction.