Like Kaa, I was instantly reminded of ep359: Chasers. However, this story had a stronger cast of characters and a much more satisfying ending. In this, Ari's unselfish, proactive efforts to save the Earth shuttle was noble and endearing, unlike Sebastian's reactive efforts to go along with Wild's selfish suicide that lead to the possible mass murder of the crew of the Eternity in Chasers.
I enjoyed the dialogue between Ari and Bill, the comfortable chat between two people who knew they were both but pawns in this sudden and unexpected political power struggle. And I loved their efforts to work together to save not only themselves, but each other. I do wish Ari's relationship with Maura had been a little more fleshed out. I mean, we're lead to believe that they are probably romantically involved, but at the same time, without any explicit confirmation of that assumption, there's no reason that they couldn't have been siblings or just close friends.
The ending was fantastic because both ships were saved, but there is still the looming effects of the actions of both crews. We know that there are going to be severe prices to pay for the choices made, and that there is no guarantee that the settlers won't still land in the near future. I did expect the settlers' situation to be a little more dire than it was, like the Earth was gone and they were the last surviving human beings or something, but the fact that they left of their own choice in search of something better just strengthens the scientists' position that they have claim to Alpha-Centauri and the settlers shouldn't be allowed to land.
The more I think through this the more I love this dilemma. Who's right? The settlers can't live in space, at least, not for any extended amount of time. But the scientists have claim to the planet and the preservation and study of the ecology is paramount because for all they know, Earth-based bacteria may destroy the ecosystem of the entire planet and make it inhospitable within a few generations.
This was a great story.