I agree with the above reviews so I won't duplicate what they say.
One of its particular strengths is that it gives good coverage of Nubia, as well as Egypt. Nubia's prehistory is often presented in a rather fragmented way, partly because the survey and excavation work itself has a long way to go before it can provide a coherent picture of Nubia's past, and partly because the Sudan is so vast. But Midant-Reynes does a good job of presenting the different areas and industries in a structured and digestible way.
The description of the Nabta Playa sequences is well expressed, but slightly out of date. It has since been refined.
On the downside, if you are new to the subject it may frustrate you to find that there are very few illustrations of artefacts or sites, which as a novice may make it difficult to get to grips with some of the descriptions of lithics, ceramics and site plans. As a previous reviewer pointed out, this book is all about things excavated from the ground - the material record - and the lack of illustration may make it very difficult to visualize what is going on from one industry to another and from one phase to another.
The few maps are okay but they are tucked away at the end of the book, when it would have been more useful if they had been dotted throughout.
I would have liked to have seen a much more in-depth discussion of the different chronological schemes for the Predynastic period, and would have found it very useful to have seen much better graphic depictions of periods and dates.
Apart from the above quibbles (of which the lack of illustrations is the most serious), it is a good solid reference text, and an invaluable overview of the periods concerned. Apart from David Wengrow's "The Archaeology of Early Egypt" there is no modern text to compare with it.