I picked up DP9's Heavy Gear Blitz Two Player Starter Kit this year at GenCon, which included a black & white, digest-sized copy of this book as well as the older "Locked and Loaded" rulebook. While handy at the table, my old eyes did have some issues with the tiny print in the reduced size prints.
Fortunately, DP9 - much to their credit - offers those same two rulebooks in full color (and full size!) as free PDF downloads here. I was very happy with both these products and recommend them as a must-have for anyone who's picked up the game elsewhere and only has the digest books. In full color, the reference diagrams and fluff artwork shines, and the L&L book also includes color painting guides for the minis!
My one gripe is that these PDFs are not optimized at all. For the page count and graphic content they are far larger in file size than they should be, especially compared to a full color layout, higher page count rulebook (a Pathfinder book from Paizo for example.)
Still, worth the price, and they ARE the full rules for HGB so you can learn to play for free, using these and some of the other free downloads at DP9's homepage, and some minis or tokens you already have on hand. A good idea before you invest in a lot of expensive minis.