Hello Sean and Trunk,
Sean, something important gained from Stealing the Fire from Heaven was, what for me is, the necessity of creating one's own personal alphabet of desire. There are other books that share similar information, but not in the same way that Mace describes and elucidates the process. There is also much information that is reiterated in the other books in my list, though in different terms most of the time and relate to some of my own personal experiences (providing me with added confirmation of both my own and Mace's authenticity of certain points). Aside from content, I find that his material is presented in a simple, direct, and usable format that I, for one, appreciate.
Cheers,
Rob