Let's say, you take the feat and cast these two spells:
Animalistic Power: Cleric 2, druid 2, ranger 2, sorcerer/wizard 2; +2 str (enh), +2 dex (enh), +2 con (enh), Player's Handbook II 101
Aura of Vitality: Druid 7; +4 str (morale), +4 dex (morale), +4 con (morale), Spell Compendium 18
So...