The text that accompanies the maps is not bad, but is definitely not up to the same standard. Some of the information is even a little dubious, especially in the discussion of human evolution. There is also a tendency to see things from a European point of view, and I would have preferred a little less on the "exploration" of the continent and a little more on archaeology and cultural history. The Penguin Atlas of African History is a reference work that should be on everyone's shelves, but it should be backed up with a more detailed history of the continent.
Note: there is a new (1996) edition of the Penguin Atlas of African History.