Well, "broken" and "epic" are by no means mutually exclusive...
I'm just not a fan of this feat. Like Persistent Spell, it's a very powerful feat that the designers chose to "balance" by making it applicable to a very oddball category of spells; a category that changes radically with every new sourcebook that comes out. There's a real difference between the "detect" spells and end to strife, and one that Andy Collins and Bruce Cordell probably didn't anticipate when they designed the feat.
Worst part is, I can't think of a way to fix it. Oh well...