Acrobat is pretty straight-forward software. There are certain tasks you want to accomplish with it, and they're not the kinds of things you want to devote unlimited hours to.
Baker understands this and has taken the perfect approach with her book. She takes 125 of the most common tasks Acrobat can perform and devotes several pages to each. She's identified the tasks with the greatest common interest and explains how to do each one clearly and concisely.
For heavy-duty Acrobat users, it saves you time from searching out how to do that one task you know Acrobat does, but can't easily find explanations for. For new - or very occasional - users of Acrobat, it highlights some of the capabilities you might not have been aware of, but will likely find useful.
Acrobat is incredibly powerful software that provides a 'better way' for doing many things. Great to have a book that identifies those many things and clearly explains how to do them.