For fans (and most definitely only for those who have already read the Vorkosigan Saga in full, to avoid massive spoilers) and rabid fanatics. I loved the plot summaries of all the books, I loved the analysis of Falling Free by Bujold's engineer brother, I really appreciated the plot summary. The concordance was less compelling, but I think will be useful during a re-read. I love, love, loved the interviews with Bujold. In short, I'm moving from ordinary fan into the realm of rabid fanatic.