I'm not really getting sold on this product.
If I want skirmish rules, all I have to do is play D&D3.whatever. Those are skirmish rules.
If I want mass combat, I either want something pretty schematic (because I'm plopping it into a session) or pretty detailed. For the former Green Ronin's Testament works fine; for the latter I can get a set of miniatures rules far, far cheaper and with apparently greater detail (Hordes Of Things comes to mind for mass fantasy rules).
So what is covered by these rules that makes them so indespensible?
Certainly not the random miniatures...