This volume represents the most up-to-date introduction to a diverse range of issues for early Irish history; and, in doing so, its achievement is worthy of distinction.* It is clear that the individual essays reflect the writers' own interests, but they also do well to interact with other studies to bring together a collage of the whole field. The essays on the medieval period in particular do well to range across various periods of rising and falling trends in the sources. While many of the individual chapters are broad-ranging in their scope (e.g. "400-800," or "up to 1169"), they do break up these periods to present the changes and transformations rather than making monolithic claims across the centuries.
To my mind, only two major criticisms may be made. First of all, the separate essays on Hiberno-Latin and Irish literature often overlap to the extent that they cover much of the same materials. For my own interests, I found it frustrating that neither acknowledges the apocryphal traditions in proportion to how it is reflected in the sources, and little is said about this preponderance of materials. Additionally, the volume does occasionally suffer from distracting mistakes of editing. Nonetheless, it is, overall, a fine introduction for any student of early Ireland.
*N.B. I did not read this entire volume, but only essays relevant to my fields of study, and my review likely reflects this.