So, as with a fwe other books that I have read recently, this one is a little dated. But, that only applies to the walk-through examples provided (the book uses an older version of Microsoft Excel when providing examples of checking and cleaning up some data).

The overall subject matter of the book: obtaining data, checking it's correct-ness, cleaning up problems, and overall handling of data is excellent. The processes described are excellent, they just need to be adapted to current application suites.