This is a unique book. The amount of personal anecdote that the author has tracked down and wielded into a coherent book is truly astounding. His attempt to do a "Face of Battle" job on the English Civil War is by and large successful.
However, readers (especially those new to the period)should be aware of a couiple of things:
1) The author is pre-Royalist, and this colours his interpretation in some areas.
2) His account of the general history of the period and the course of the major battles relies too much on either generalist work or books that have since been surpassed. For example he ignores Newman's account of Marston Moor.
3) The editing and fact checking is poor in places. For example there are accounts of parliamentarians fighting roundheads (!), and the assertion that Rupert's dog was killed at Naseby whilst Rupert hid in a beanfield is just unforgiveable.
Having said that everyone with an interest in the period should read this book.