Just a quick confirmation, why is Pain Strike and Mass Pain Strike technically an 'Evil' Spell? While I can understand the 'causing pain' part of the description as falling under an 'Evil' theme, just about every ability, spell and item a PC can pick up will be used to cause pain to something. The intimidation bonus does, however, speak of the spell being an easy tool for torture and stand-over tactics.
As one of the few outright 'attack' spells that causes Non-Lethal Damage without the requirement of the Merciful Metamagic Feat.
(incidentally, +1 to Paizo for making this feat not increase the levels of the Spells so affected.)