Content warning Discussion of the ending
For most of this book I didn't expect to continue with the rest of the series. I very much enjoyed the spider scenes and seeing their culture, values, and technology evolve over time, but I didn't much care for any of the human scenes until right at the end.
One aspect that I particularly liked is that, ironically, the spiders are effectively Humanist at the end while the humans take on the place of the un-evolved animals who think of the spiders in a predator/prey relationship. The spiders then turn the tables and uplift the humans in the same way (and using the same mechanism) that the humans originally uplifted their civilization (except by bootstrapping empathy instead of sentience). It brought the whole thing to a nice conclusion in a circular way and made me decide to try the second book as well.