Two previous books from fullstack.io were clearly & indisputably the best book on Angular 1.x & 2.x. Most complete, continuously updated (every few weeks), very hands-on (with examples far more realistic than usual 'hello-world' style tutorials. I'm happy to tell you that their latest book on React is as good as those were.
Good thing is that this book addresses almost whole React ecosystem - including Flux (Redux as an implementation), Jest, Enzyme & even React Native (but very briefly, so if you're interested in this particular topic, you'll need to look for more resources).
What was I missing?
1. It'd be nice if the book has covered at least one of React UI Frameworks (sets of components aimed for rapid development / prototyping). These are great examples of higher level abstractions that not only help with achieving an effect faster, but give at least a glimpse of how react-based component architecture may look at a higher level of abstraction.
2. Actually, I've done some React development 1-1.5 years ago - one of my clearest memories is how immature was the Windows tooling. I'm just curious regarding how does this look these days - are all the key tools usable out of Mac/Linux?
3. There's not much on everyday activities like debugging / trouble-shooting React (with tools like react dev-tools). Fortunately these are really a no-brainer.
In general - highly recommended.