There's a lot of sound advice here that will give you enough to make good decisions. OTOH, some of it can be dispiriting and even depressing.
The good part? The writing is clear, examples are shown, and steps are provided to decide IF and HOW you should relaunch a book (mostly this is series-oriented). It has made me decide not to do much more with the College Fae series as it doesn't fit into what I plan on writing in the future.
I really enjoyed the case examples, even though most of them were about his own books and SF. I would like to have seen more diversity in the genres he was discussing.
To make this book a five star, I would also have preferred a few action checklists and mentions of advertising outlets other than Bookbub, Amazon, Facebook, Freebooksy, and a vampire newsletter. The back could have easily had a list of popular newsletters with links.
His idea to find book covers from deviant art is also outdated. Plenty of book cover artists are on FB who are offering pre-made covers at a lower cost. Nothing is discussed about the pitfalls of AI (probably a technology that wasn't on the horizon when he wrote this book).
Laughable was the idea you can "tinker around with Photoshop." ROFLMAO. I use Photoshop and, trust me, it is not for beginners. A better suggestion would have been Canva.
The depressing? The same write-to-market philosophy you see every get-rich-quick writer-promoter goes on and on about. The W2M that encourages mediocrity, fast writing to tropes, a genre outline of what readers want, and very generic covers. Is it a way to make money? Sure is, but is it sustainable especially with AI about to write your mediocre books in the thousands? Time will tell.
For an author who likes to write original works (like I do), this idea is discouraging and yes, depressing. The trick is to find a happy medium and most of these W2M books do not provide that (and neither does this one). It's either their plan or forget ever being seen.
The bad? Not so bad, but a little of the advice is dated. Amazon no longer allows category and keyword stuffing. That is very limited now. Also, Amazon now punishes any collections/omnibuses priced over $9.99. How much the author receives from a book over that price drops dramatically and Amazon won't organically promote it.
Nothing is discussed about other bookseller markets which I assume is covered in his Going Wide book so why he didn't put any info here.
Something I would argue with him about is book cover design. He wants all your books to have the same fonts for title and author in order for the reader to recognize your brand. LOL. Unless you are dropping the type of money McDonalds and Coca-Cola has on your advertising no casual reader is going to say "wow! That reminds me of author's so-and-so brand!"
The caveat here is that a series should absolutely have the same fonts used in title and author name, and the covers should match genre and style so they look like they belong together. BUT, having all your series look the same? Hm. As a reader, when I see ALL books look the same (but different series), I give it a hard pass. It screams boring.
But that is what the write for market crowd goes for -nothing memorable. Bubble-gum books that can be read and thrown away quickly. Appease readers who want to junk read by playing to their favorite tropes. Don't rock the boat. Do the same as the other popular authors.
Like I said, if you think about it too much you'll become very depressed as a writer who wants to develop your own voice.
Overall, a sound book but you might be able to find more relevant info on his YouTube channel which is heavily promotes throughout the book.