What spells would you use the Persistent Spell Feat on?

[Rook]

I think a much better phrase would be "of questionable balance" or some such. I don't think anyone doubts that a Persistent Divine Favor cast by a 15th level priest (+5 luck bonus to all attack and damage rolls for 24 hours) is "of doubtful contribution" They're of incredible contribution!

 

[Ace]

I rule zerod the spell some time ago to allow it to be used with any spell that has a duration.

This seems a little munchkin to some but I like the flexibilty it gives frex I have no problem with it being used with Monster Summoning series.

Sure You can Summon a Fiendish Hawk for 24 hours but that makes it a fifth level spell. That seems fair to me.