First, acknowledgement of limitations: I can’t approach this as a student of philosophy - I don’t have the foundation to offer insight into the book’s historical accuracy or academic novelty.
What I can offer, as a novice, is that this was one of the more accessible works on Greek philosophy - or philosophy in general - that I have ever read, in large part due to the domineering presence of the author. Stace is ride or die for Aristotle. The Sophists are chumps. The Upanishads are his least favorite album, and he was real into Plato’s earlier work before he got experimental. It’s like being at a family reunion, trying to make conversation with that uncle you have a hard time with politically, and finding out he has a doctorate in classics. Four hours later (and several reminders that the preferred term is now “Asian”) you’re not sure how much you’ve learned, but you darn sure know how that uncle feels about Anaxagoras and the Epicureans.
I’d pick this up if you want to learn about philosophy, not in the academic way of having a well-rounded appreciation for the subject, but in the way that listening to drunk sports bar patrons is the best way to learn about the NFL playoffs.