It's not the main feature of the warlock. It's not even close to the main feature of the vigilante. I'd put it somewhere parallel to the evil eye hex. Way above cantrip/orison but below sleep hex or casting a spell. It's a nice thing to do any round in combat.
I would like this feature pumped out into class archetypes like martial versatility. I want to trade my wizard's familiar for it. I might be willing to trade my arcane pool and spell recal for it. I'd even sacrifice spontaneously summoning natures ally X for it.
I'm not recommending that this go in ultimate intrigue because that's obviously not going to happen. I just think it should be released in something at some point.