The main advantage over the book is the inclusion of bird sounds, which is a huge help, but Considering this is the same developer as the sibley guide to NA, you think a few of the minor, yet ultra important features would have carried over. Thumbnail pictures next to the bird names in taxonomic index for one, and the ability to narrow the list to within the province/country in which you are located. Being in northern TZ, I dont need every bird whos range barely steps into Rwanda and Uganda and not at all into Tanzania... Still, better to have this than nothing!
Genuinenard about eGuide to Birds of East Africa, v1.5