TwoSix
Everyone's literal second-favorite poster
It's slightly different in that the DM isn't having to make a decision as to whether or not to take the action after each turn, it's simply at a fixed spot in the initiative order. Also, legendary actions are normally specific actions allowed selected from a menu, giving them extra turns would give them a wider range of possible responses.Isn't that basically the same as legendary actions?
Not really different from a balance perspective, but it does play out a little differently.