Allan Schore has been one of the main advocates of rapprochement between developmental neuroscience, psychology and psychotherapy. As such, he deserves credit for popularizing what clearly is a promising interdisciplinary approach to resolving the question of which neurobiological circuits drive emotional attachment between the infant and its mother. The field was founded by John Bowlby who discovered that contact with the mother literally shapes the child's brain, so that the early experiences of connection, separation, deprivation, and bereavement determine its behavior as an adult.
Schore gives full credit to Bowlby and his successor Mary Ainsworth and also provides a worthwile compilation of biological research performed between 1950 and ~1995 (although there are a few post 2000 citations). He also furnishes insightful information on Freud's early interest in the neurobiology of mind phenomena.
The problem with both books is their lack of organization and Schore's evident bias towards his own pet theories at the expense of contradictory evidence. Schore has adapted Joseph's idea that attachement behavior results from limbic connections with the right orbitofrontal cortex an, in these two books cites every imaginable (reputable and disreputable) evidence that might be congruent with his hypothesis. The contribution of dorsolateral prefrontal cortex, or the left hemisphere is completely ignored, as are many subcortical circuits (such as the insula) unless this supports Schore's ideas.
More significant problem with the books is that both go over the exactly same material. same evidence, and ypothesis, is repeated ad nauseam, literally hundreds of times. Both books could easily be condensed in a single volume of ~150 pages. There is also the question of outdatedness: the substance of the text shows little (if any) difference from Schore's (seminal) 1994 book "Affect Regulation and the Origin of the Self". Finally, i think that Schore writes in a needlessly technical manner that complicates more than reveals, taking the easy way out by citing directly from primary research papers instead of summarizing and condensing what is known.
Be that as it may, there are not many other books out there on this topic and if you haven't had the chance to read the 1994 tome, you could easily skip to ADDS/ARRS.