I'm impresed with the large and varied number of summons in the FF series, and at the many uses they tend to have. I'm a big fan of summoners in any game they appear and always try to have on my party. But since FF already has its base of summons/espers, I think it's easy to get used to them and just focus on their use. However, if you ever take a couple of minutes to google them up, you might find a few interesting things about them. For example, Bahamut surprised me when I found out that its origins are in Arabia (I'm not sure, I already forgot) and that it is originally a fish of enormous proportions that upon its back carries a bull that holds the world (or something like that).

Ifrit also has its origins on Arabia, as a demon of fire. It can also be spelled as Efreet.