The book has a few typos and the writing is in places 'clunky'. I understand the subject matter quite well, but at times I was confused!
To get back to the positives the book itself isn't half bad as a broad account of the War and the organisation, uniforms and tactics of the Swedish army. There is some interesting stuff on the development of fortresses in the region and of the critical naval aspects of the war. I would have liked a map of the theatre of operations nearer to the beginning of the book though, and maybe some orders of battle.