Not bad but not that good either as the writings and organisation are a bit difficult to understand. Concepts are not well introduced and examples are poor.
Pretty interesting book. A little outdated, so i didn't bother following along but got a good look at how node use to work. The sections were very brief and quick introduction like testing and deploying. Probably should just reference the node and express docs for more detail but fun and nice read.
So, I don't have any other coding language books to compare this to, but I had to learn Node.js really fast, and this book was really useful in getting me up to speed on the concept, architecture, coding and usage conventions, etc. I probably wouldn't recommend this for someone starting out to program (there are some syntactical errors in the code that come up during execution, and I personally find the coding style used by the book -- semi-colon, spacing, etc. -- occasionally annoying), but if you already understand javascript and have used package managers for coding languages before (and therefore are over raising a stink about such things), this will get you up to speed. I read this on Safari Books Online, worked through and played with the example code, and was well on my way on my first project: developing an API test suite.
Oh yeah... SBO also has some videos to go along with this too, which might be helpful for explaining some of the diagrams in the early chapters.