If you are a US resident researching your Irish ancestors, there is a decent sectionpointing out which US records may be of assistance. The book seems written in general, though, forthose who live in Ireland or are otherwise able to get there to do research. I would have found ithelpful to have a little more information about what each agency is able to do by mail (or online)for those of us who can't get to Ireland!
All in all, the book was well worth the money.