People seem almost willfully ignorant of the connection between your masked persona and your real identity. Prerequisite(s): Bluff 5 ranks, Perform (act) 5 ranks, or dual identity class feature. Benefit(s): Your dual identity is never considered publicly compromised barring some massive, public unmasking, allowing you to benefit from your dual identity or masked persona regardless of how many people know your true identity. You gain a +5 circumstance bonus on Bluff skill checks to convince people your masked persona and your true identity are entirely different people, and on Disguise checks to maintain your masked persona.
The feat reads as such, from that I can’t see anything that can be gained from the ability without that class feature. Am I wrong on that. Maybe the “or” is a typo and they meant “and” instead?
I took it by mistake on a previous character not realizing it went with a class feature. Then again that character was an optimization nightmare and I ended up just rerolling first chance I got. So doesn’t really matter now. I might make a vigilante some day once I get over my obsession with casters.