I don’t think the information could harm me. And since I have a hard time taking seriously theories that claim I have no choice about my future, I think the self-research could be a good thing. I’ve got plenty of things that, now that I’ve lived them, I’d like to redo. So I can imagine that being able to preview a set of choices and outcomes would be useful. I could avoid purchasing that whatever that wound up being a bad investment. I could get screened early enough for the cancer (or whatever) to be caught and treated before it kills me… Or not cross that street at that specific time the car hits me. Whatever. I would know how certain choices pan out, and whether (and how much) I want to adjust my trajectory with regards to those examples. (And to the extent that my loved ones show up in my book, I could cue them in on things that they might want to address, too.)
This is assuming I could know the book was legit! I’d have a lot of questions for the author.