Well, we didn't get Darcy.
We would have -- we liked her -- she's had a rotten time and needs lots of love and attention, and she liked us and Kate too -- but she had bonded with another dog at the shelter, and he needed a companion dog in his new home, so Darcy was it. She'll have a good home, and that's all that matters.
But as UO said, it's galling -- it's one thing to have lost her to people who wanted her for herself, as we did; these folks just wanted her as a freebie of sorts.
However, one depressing thing my research has turned up -- there are lots and lots of border collies out there that need rescuing. Duh -- lots and lots of dogs, never mind BCs. It's just the breed we know the best. So we'll find the right one for us. And as long as they go to good homes, I don't really care (much) how often we lose out.