Arcane Discovery: True Name. Any success stories?

[Reynard_the_fox]

An 11th level wizard can pick "True Name" as a feat, granting him control over an Outsider with 12 or less HD. http://bit.ly/T04kL2

Has anyone taken this feat? How was it? Alternately, does anyone have a short list of good outsiders for this?

[thefortier]

I like using to summon a kolyarut inevitable. Enervation and vampiric touch at will. Decent combat abilities. Typical use would be ranged debuff via evnergy drain and protection should my wizard ever require it. Frees up the protect the wizard task. My wizard is a god wizard a la Treantmonk style play, so having two debuffers is very handy.