Kodam said:
[...]I don`t have either PLH nor CD but I think I'll have a closer look. Thanks a lot! [...]
Come a little closer....
closer....
a bit more....
now you see....
All of the feats are General:
Spontaneous Summoner lets you spontaneously cast
summon nature's ally (1/day/Wis bonus), if you are able to cast any of the
summon nature's ally spells and if you are partially neutral in alignment and have at least a Wisdom score of 13 and 4 ranks in Kn (nature).
Celestial Summoning Specialist allows you to broaden your summoning lists (DM approval needed) to include good-aligned creatures for
summon monster spells. You now don't have to trade monsters on your list on a one-on-one basis. You have to have a nonevil alignment, 2 ranks in Kn (the planes) and in Kn (religion), and you must be able to cast any
summon monster spell.
Fiendish Summoning Specialist allows you to.... but with evil creatures.
Stalwart Palanr Ally lets you gain a tougher creature (+4 AC bonus/Saves) that lasts for the double amount of time summoned, if you have Charisma at least of 13, 5 ranks in Spellcraft, and the Planar Touchstone feat. You need to link yourself to a specific plane of existence to summon the tougher creatures from.
Kind regards and enjoy the CD/PLH.