Good end. Or, would that be "Good start"?

Sure seems like. Though even with 'nice' Raditz, the sight of Piccolo laughing like that is a bit odd considering the timing of when this would have happened (putting aside that I don't think he's EVER laughed outside of mocking/evil laughter).

He was laughing when Kuririn was talking about what he wanted to do after they thought Frieza was defeated.