This book, along with several other Osprey titles by Stuart Reid, is a fine source on the warriors of the Scottish Highlands at the time of the Jacobite Rebellion of '45. To the average person, these are what Scots are supposed to look like, with the kilts and plaids and bagpipes.
For me, the most useful sections of the book span pages 3-13 and 50-55; the first dealing with the social origins of the Jacobite warriors, and the second detailing their battle tactics; the latter topic has often been misunderstood by students of history. A good slice of the book takes the individual Highland regiments and examines their uniforms and flags-information that is admittedly only useful for someone with a professional interest in the topic. For lighter reading on the Jacobite Army, I would recommend Reid's book Highland Clansman 1689-1745.
The plates are up to Osprey's usual standards and help clarify the descriptions of the various regiments. Overall, this is an excellent source for someone interested in the history of Scotland, or in the 18th-19th Century Highlanders; though I am not sure I would recommend it for an introduction.