Any experience with their Storm, Kafka, and D3.js books? For the first two, the communities and versions move so fast that I'd be surprised if a book could be

Any experience with their Storm, Kafka, and D3.js books? For the first two, the communities and versions move so fast that I'd be surprised if a book could be kept up to date. (Storm just hit 0.9; Kafka is now at 0.8. I wouldn't recommend that anyone use older versions at this point.) Following the mailing lists seems to be the way to go in those cases. Anyone disagree? With regards to D3, it seems like the online examples are prolific; it is hard to imagine a book being needed. Besides, it is more fun to tweak D3 directly.