Nothing cheesy about it. The Utterance-learning feats aren't good enough to be considered cheese.
Technically, IIRC, you can't actually get the Vigor aura via the feat. I don't remember why, but the book lists some kind of restriction as to what auras are available and what aren't. However, this can still be a very worthwhile feat -- for a character that's already Dragonblooded somehow, that is. (Such as a character with Dragontouched.) For example, the Senses Aura, eventually, is like giving every party member Improved Initiative and Alertness x2. Considering you get all that for one feat, and Improved Initiative is considered a decent feat in its own right ... yeah.