Huge! If SpaceX pulls off a ship catch, it'll be one of the biggest milestones and achievements for the program so far. Or, if they miss too late, potentially one of the biggest disasters if they take out launch infrastructure. Excitement guaranteed.
At the same time, it's depressing to see the 1st stage seemingly take a step back. Hopefully this is just a reset to a new local minimum on the way to a higher local maximum.