This Canto abridged version gives in nearly 200 pages a good account of the motives of the "west" to start the crusades, the reasons why the Byzantines agreed, the very indivual human motives of the kings, popes, clergyman, nobles, and poor. It also spells out what it takes to get (mostly on foot) from France to Jerusalem, with a large mass of poorly prepared people. A fascinating account.
If you have romantic ideas about the crusades they will have been replaced by solid facts out of the everydays crusaders lives at the end of this book. You'll have a better grasp of this era as a whole, and the place of the crusades in it.
Sometimes there are more scholary details offered then I really need in an abridged version. But it still is a good read, that offers you the flavor, the look and feel, of the past.