The book was only published 2 days before you originally asked the question it's a bit early for reviews yet.
Darina Allen is very well known, she has run the
Ballymaloe cookery school in Ireland since 1983 formerly with her husband Tim although he withdrew his involvement with the business in 2003 when he became a convicted paedophile. Her daughter Rachel is a well known tv chef & her brother & her mother in law are both very well known chefs so there is plenty of experience within the family therefore the book should contain some worthwhile recipes.
There is a newspaper article about the book here:
http://www.irishtimes.com/newspaper/magazine/2009/1031/1224257534709.html