I am an advanced excel user who did not gain much from reading this book.I have the following issues with the book -1. There is not enough information on good layout design or designing spreadsheets to minimize errors or mistakes.2. It doesn't discuss why people are making particular errors or in what context errors are being made. Sure I can look out for issue x, y, or z, but in what situations would those issues come up in the first place?3. There are some points that are very obvious and other points that people will never use.Again, I did not learn much if anything from reading this book. It may be good for the beginner, but not for the advanced user.