It's new to me! It certainly looks good, or at least like something that could be increasingly useful to an increasingly large group of people. But it's a whole book and I have only a few minutes' break to check HN, so I can't evaluate it for quality until I've had a chance to read it (and I definitely will, because it looks useful to me). I assume, being new, few other people have experience with it to comment. And fortunately whenever actual math and code show up, the AI maximalist/doomer blabbermouths tend to stay away.