In this book, David Bohm's (probably) last major work before his death, Bohm and Hiley outline in some detail Bohm's original work on the "quantum potential" which he developed from de Broglie's earlier attempts some years ago. This book brings together Bohm and Hiley's work dealing with the quantum potential approach for varied quantum phenomena such as photon absorption, photon emission, the measurement problem in quantum physics and so on. Throughout it is wise to remind oneself of Bohm's comment on this approach when he stated that it is only one possible exploration of an idea and not meant as a final theory by any means. Bohm points out repeatedly that in order to develop the quantum theory further it needs new concepts/philosophy to delve into deeper aspects of reality. If these thoughts are not kept in mind then one gets the distinct feeling that there is something incomplete in the work as it stands. Bohm's attempts at another approach are made through his ideas of the holomovement or implicate order which, although nebulous, is explored in its principals at least as in much of Bohm's other works.
I don't believe, like other reviewers have stated, that these ideas are vacuuous. New ideas are absoltely necessary in contemporary physics where the pure mathematical developments of string theory feel empty of real depth. Although speculative, at least Bohm's ideas sound physical and have a physical underpinning as those of Schroedinger, Heisenberg and Bohr in the early 20th century. The difference is that these other great physicists had some experimental work to guide them, Bohm does not, or very little. His ideas rely on the ability of experiments to probe deeper levels of reality between what is possible now say 10^-15 m and 10^-35 m, the Planck length. There exists a huge range of orders of magnitude to explore. I believe in fact the last couple of chapters of the book are the really interesting bits which contain such deeper explorations.
It is unfortunate Bohm died early and it is hopefull that Hiley et al will continue his great work with the same radical enthusiasm and not be unconsciously hamstrung by the current mechanistic paradigm.