I can't speak for everything in the book, not being a sociology/philosophy major (Foucault... I hate you so much...) but a majority of Jessica's work just confirms what I've always thought about the fandom being in it - it is just like any other fandom and has characteristics of all fandoms, with a little querks here in there from being based mostly online.
The book goes through a clear overview of research on the fandom so far, the responses of furs to less than stellar reception and critiques existing research so far (especially FurScience, which always stood out to me as a bit biased and methodologically flawed). It then gives its own hypothesis (lifestylers vs. casual fans) as well as avenues for further research, including BIPOC which I appreciated.
Overall, worth a read for a balanced outsider's perspective on the fandom and comparisons with other subcultures.