Some of the battlemaster maneuvers are a bit weak or low in utility.
In our game, I replaced Second Wind with a reaction for the same number of temp hit points (which are immediately used for the damage being taken).
It makes more sense to me that the Fighter can react and deflect most of an attack off of his armor, than it does that he can heal himself.
It typically results in more or less the same end result, but the flavor is different. And it prevents the Fighter PC from taking multiple short rests to heal himself up from low hit points to high.
I like Second Wind. Felt like he was psyching himself up to push on like an athlete does.