I, too, have purchased these rules and I have found them to be more than just a set of mechanisms.
First, I love the wat Trebian has "Disorder" as a key concept of the rules. I think the way the bases are used (Support, etc) and the formations are unique and different as well.
I feel there is plenty of information to get started in the period, and, praise Jesus!, a bibliography of obtainable books on the period that I can afford if I want to expand my knowledge of the period.
Artillery is simplified, but not simple. And I love the Poor Rifles rules. The part on tactics reminds me of later ACW period tactics, as in 1864.
There's enough information on flags, uniforms, etc to get one started, without making it overwhelming.
Looking to use my Fire & Fury based ACW figures as proxies until I can get "proper" figures painted.
Sorry if this was a bit of a jumble, but I am very excited to put these rules through their paces.
Eric