Heavy Gear 2nd Edition was one of the first tabletop games I bought. It's enjoyable and fun. It's also (or at least to my relatively novice skills when I got it) fairly obtuse.
The universe is well-detailed, and the gameplay is fun, but it took several hours worth of reading just to understand the functions.
However, you get a lot with this book. You get a combined RPG and tactical battle game, as well as a fair amount of flavor (still enough to allow them to publish a ton of sourcebooks, so not too much, but enough to satisfy). The art is top notch (it's no surprise that Dream Pod 9 sells the art in books as well).
It's good, it uses a lot of six-siders, but there's something missing in terms of plain examples and explanations.
[4 of 5 Stars!]