It's a good story, mostly plot-driven. It's not one of the strongest of the series, but not the weakest either. And almost everything else I could say would be a spoiler of some sort.
Bujold had said, years ago, that this book would be a while in coming for a particular reason. That reason is not part of the main plot, but occupies the last chapter and a bit. She did something unusual with that last chapter. On the one hand, I feel a little cheated. On the other hand, I think the last hundred words, by themselves, were entirely worth both the wait, and the price to read the book today instead of waiting any longer.
The spoilery opinions I shall hold for a little while.