Of the demon books I've read so far, this is far and away the worst. And it doesn't even spend much time on history compared to the others! So far, it's had some really shitty editing (identical sentences appearing in several places, some minor grammatical issues) but, as always with demon, the number on issue is cultural insensitivity. Though in this case, it's not even something related to demons! It's just referring to a group of black people as "blacks" (specifically a "gang of blacks" which is actually SO MUCH WORSE)
The rest of the book is mostly just piles of characters and a bit of structure for the local Fallen. There are really only two things of significance in the book: metaplot involving Lucifer (though some of that falls to some of the published fiction) and the structure of the Infernal Court. The latter is the only real saving grace of the book, putting in the political structure that the Fallen would generally fall into in print and in detail. This piece is near essential for Demon players and STs, though the rest of the book can safely be ignored if you aren't running your game in Los Angeles, and even then, may not be of great value.