I was expecting to only skim this book, because I was primarily interested in reading about my type and relationship combinations, giving special attention to the 2-5 relationship, since I am a 2 and many of my closest friends are 5s.
But then, because I am a 2 and I care a lot about the people in my life and relationships in general, I ended up reading the whole thing, and just imagining various combinations of various people I knew to provide interest.
And I did enjoy it! It's an easy read. I've done a lot of independent enneagram research, so I was worried the enneagram background might be boring or a little basic, but the author keeps it brief, so it mostly works. The relationship combinations, because all 45 are listed, are not super in-depth; a little more so than the author's Instagram account content, but not that much. I also do think it'd be interesting to dig into wings and subtypes for the double type combinations, but I understand why the author chose not to. I also appreciate that the author emphasizes that healthy adults of any combination can make it work. I know some typology experts prefer to avoid commenting on the interplay at all because it can make people so weird about what the "ideal" match is, but I like that the author strikes a middle ground of commenting on these different dynamics (because they ARE interesting), but also emphasizing that a relationship is between two individuals and that matters.
I will add, though, that because the descriptions are generally pretty short, when you read it straight through the way I did, it can get a little repetitive. A lot of "like any double type pairing," repeated emphasis on the health of the individuals mattering, etc. I mean--it's important, so it's fine. Also, where I found this book most useful and interesting was when the author actually commented on which type pairings seemed to be common based on her informal data collection via Instagram. More up-to-date and likely more accurate than the only other data I had found from some vague obscure old website.
Overall, not revolutionary, but probably mostly because I do so much of my own research. Still a quick, interesting read--and the first full enneagram book I decided to just read from start to finish, so there's that, too. :)