How good is this series?

[Conquistador]

Anyone know from experience how useful the following is?

Campaign Secrets of Wargame Design: Volume 4: A Tabletop Toolkit of Ideas, Analysis, and Rule Mechanics - The fourth volume in the series offers twelve different rules systems for running campaign wargames, each of which can be used with tactical rules of your choosing. Run them via snail mail (as Wally did with friends across United States and in the United Kingdom) or email (the modern equivalent), using the historical background provided or adapt to your own historical or imagination campaign.

If you've ever thought of running a campaign, large or small, among friends or for your club, this is the how-to booklet that brings together experience and shortcuts from a dozen campaigns. Adaptable to many eras. Includes maps, diagrams, and explanations of concepts and mechanics.

Gracias,

Glenn