Thanks for the replies.
Not sure what the great appeal is of Rainbow Servant.. is it just access to the cleric spell list? We do have a cleric, and as a gestalt I'm already going to have so many spells/powers that I'm not sure I need more...
It's not just
access to the cleric spell list. It's access to the cleric spell list, coupled with spontaneous casting and the ability to know all spells on your class spell list as soon as you gain access to that level of spells. In other words, it's casting any cleric spell in any book ever, any time you want
(except domain spells). A genuine cleric has to predict what's going to come up and prepare accordingly. You don't, if an obscure challenge comes up you're ready right now.