These eight volumes on Indian philosophy provide a nice account for what can be found in scholarly publications. Do not expect a fine philosophical analysis from these volumes, the focus on historical representativeness does not leave enough time to discuss anything else than the main points. One cannot summarize the Indian philosophy over such a large period of time without leaving untouched some important aspects.
The contribution of these volumes however remains the focus on showing what are the holes in our knowledge of the Indian philosophy from a scientific viewpoint. This contribution is extremely valuable to counter-balance the many misbeliefs Western as well as Eastern scholars might have concerning this tremedous Indian "heritage" which largely remains to be discovered. A must-read for all scholars wishing to gain a more accurate picture of the development of Indian philosophy.