This is an invaluable account of a little-known but action-packed slice of Yorkist history. I doubt there is a better secondary source for the events of 1469-70, though if there is I'd be glad to hear of it.
There are some quite extensive quotes from Chronicles, so if you doubt the interpretation of some of the history you can check out the sources and decide which version you prefer.
I would say this is not really for the beginner, but a very valuable book if you are already fully aware of the basic milestones of Yorkist history and want a bit more detail about the events of these years.
This book has now been completely superseded. The main section, on Edgcote, ignored one major contemporary source, and misunderstood those available in Welsh. Its reconstruction of the battle is barely credible, having one army cross a river in the face of the enemy unmolested. The author does not understand the approach marches of the two armies, and places the numbers present at an incredible 40,000 in total.