It's a brilliant work, but a bit too philosophical. Guizot has a view of civilization that he wants to propound, but what's most fascinating is the emphasis he places on class struggle in history. The excellent introduction here suggests that it was of Guizot (and folks like him) that Marx was talking about when he admitted (in the Manifesto I believe) that he was not the first historian to recognize the importance of class struggle, but only the first to recognize, among other things, that the end of class struggle will be the victory of the proletariat and the emergence of a classless society at last.