The book has some merit to a reader new to Excel, and who wants something a bit more indepth than the Idiots or Dummy's books on Excel. Proctor gives examples that do more with the spreadsheets, and you get to appreciate what Excel can provide.
But, as other reviewers have cogently pointed out, the book really is not for business professionals, despite what the title says. An accountant or businessperson should already have more background on financial modelling with spreadsheets that the level provided here.