I thought it was wonderful that we got a 30 minute coda to the story (although I need to watch it again without the worry that that someone with a gun was going to jump out of the woodwork at 9:40 pm) - I hate it when a story ends with the death of the bad guys and everyone smiles, then fade out. I always want to know how they lived after that, without a mission. And here, we found out. It made sense that Allison would continue to be the nurturing mom, who wants everyone to just relax and enjoy being together, and Helena to settle into a home that she never realized she needed, and that Cosima would continue to make crazy science as she and Delphine go forth to find and cure the Ledas... like Sarah, she needs a mission. Even Rachel's ending made sense - it's probably not going to be a happy life for her, but it's the life she wants. I can imagine that Krystal may pop in, with another weird mystery for Art and "that Australian" to solve, and even Tony may visit his sestras, now that it's safer for him to do so.
With Sarah, we saw that when the mission- her fight- ended, and she had time to stop and breathe, she now was mourning S. I thought that her walking out on the test was not that she hadn't changed, but that she hadn't accepted she had changed. She was used to S. picking up the slack for her, and without S., she thought she couldn't do it alone. Her plan to pick up and run wasn't because that was still her character, but because she was afraid it was her still her character. She's been fighting the conspiracy for (2? years), and now that she's not, she hasn't yet figured out that her new battle is internal, not external. Without S. as a rudder, she's scared, and a scared person first tries to behave in what worked before. But that scene with her other sestras helps her realize that not only will Cosima, Alison and Helena (and Felix, and Art, and even Delphine) be her rudder, but they give her the encouragement to trust her own rudder.
It was a beautiful ending, and I loved it. I loved how it showed that for some people, the ending of the war doesn't mean they can immediately adjust to the new world, even if it's a world that they fought for.
I will really miss this show, but for me, it went out on a perfect note.
(Which is not to say that I won't be the first in line if there's ever an Orphan Black movie... there's certainly enough potential for great stories to be mined in this new world).