Buy a non-MS Press version for better pointers
Had I realized that this is basically a Microsoft manual, I wouldn't have purchased it. Since receiving the book, I've thumbed through it twice, used it once to reference a scheduling question I had, and it's sat on my bookshelf since then.
Don't get me wrong - I love Visio. I just have this innate feeling that the fox writing a manual on how to enter the henhouse ain't gonna give me the full scope on the program. My experience has been that manuals & guides written by 3rd party authors unaffiliated with the software company about which they write tend to be more candid about the product's faults, and, curiously, better informed about making the product perform better.
If you want clear and candid advice on making Visio jump, buy a 3rd party guide.
Microsoft Office Visio 2007 Inside Out
This book is good for the person that is using Visio and wants to update skills.