The opening chapters of Pinch's book are fantastic: her explanation of Egyptian concepts of time, religion and culture is among the best I have read on the subject. With this foundation, she then goes into detail of differences (in the Egyptian understanding of the cosmos) between "linear time" and "cyclical time" (the ancient Egyptians were big on duality: night / day, good / bad, male / female, and of course, linear / cyclical reckonings of time.) The first 100 pages are really worth the price of the book for this reason.
The remaining 200-ish pages are an encyclopedia of sorts, the symbols, dieties and broader concepts of Egyptian beliefs are explained and cross-referenced. While this was interesting in and of itself (as encyclopedias tend to be), there is no narrative "thread" that ties this together other than how these dieties relate to the broader cosmological world of ancient Egypt. For this reason, I deducted a star.
In all, it is a very good guide to understanding the literature and culture of ancient Egypt, and I highly recommend it on these grounds alone. One caveat, however - my first copy for some reason, had a printing error, where pages 82 - 114 were missing; (pages 57 - 82 were duplicated in its place), therefore skipping some of the meatiest parts of the book. (The book store I bought my copy from was gracious enough to replace it.) Caveat emptor.