First off, this review is for the second edition of Psycho-Oncology, and is from the perspective of a student in health psychology.
This book provides a broad overview of the field of psycho-oncology. Each of the 97 chapters is relatively short (my guess is they average 6-14 pages) and self-contained. I found this layout very convenient because it is possible to read about a particular topic (e.g., interventions, specific cancers, etc.) without needing to read everything. In general I found the language quite accessible; I would think that advanced undergraduates and above could benefit from reading it.
Many handbooks take several years to make, and in fields that are rapidly developing this means that prior recommendations/general conclusions may already be deprecated. So I was quite pleased to see numerous references from 2008.
On a less positive note, I did notice quite a few small typos (e.g., wrong table referenced, slight numerical inconsistencies, a repeated sentence). Also, when some of the chapters reviewed the research, it seemed like there was sufficient research that a meta-analytic combination of the findings would have been beneficial rather than simply listing findings (I appreciate that this can be challenging or even impossible when similar constructs are measured in divergent ways or inadequate information is reported by the original author).
Overall I have really enjoyed reading Psycho-Oncology. It is an easy way to get a good background in the field of psycho-oncology.