The fact that Griffith crams an introduction, seven sets of rules (including playsheets) and then a conclusion into 127 pages gives some indication of how concise each of them are. There are no nit-picking detailed differences between nationalities, units etc (although for some reason blunderbusses warrant a special rule in the skirmish section). Instead everything is simplified and, dare one say it, broad-brush. Personally of the various levels covered here - skirmish, brigade, divisional, army level, generalship, map kriegspiel, and tactical exercise without troops (that last seeming to be basically going for a walk whilst having a chat) - it's only the divisional that caught my eye as being something that I would actually want to play. But the rest of the book is full of fascinating ideas which being clearly based on a deep knowledge of the subject inform one as much about early 19th century warfare itself as they do about replaying it in miniature.
This is that very difficult thing to achieve: a serious book that doesn't take itself too seriously.