Just buy it, it is good.
The earlier you buy it, the better.
I just started with Zorro, C, and it could have saved me a lot of time.
Of course, if you are a professional developer, maybe it is not what you may expect, but if you start with Zorro, it gives you a lot.
Some of the critics complained about the strategies, so he did adjust them in 3rd edition a bit.
Some complain it is basically the manual as a book, well partly that is true, difference is, and that is important, the book leads you somewhat guided through the important parts to start with Zorro.
All in all, the critics are exagerating, the book is good, of course, we all always want more.
So I can't wait for another article on the financial hacker
And about redundancy, yes, of course you will find almost everything in the manual, it is, because the Zorro manual is one of the best I did ever read.
Since almost 30 years, doing IT, and almost never found any manual as good as the one of Zorro.
So yes, it is redundant, but different. Yes you will somewhat understand the critics, but I never regrett buying it anyway.