Just a quick FYI, these rules are actually slightly outdated. What this rulebook really provides is the background setting and great history about the world.
It also included a nice painting guide and army guides for building your units.
But the rules have since been updated, and you'll need the Heavy Gear Blitz! Field Manual for that. I would consider this a supplement with great fluff and some painting guidance. But it's free now, so perfect!
[5 of 5 Stars!]