If you're going to be involved in stand-up martial arts or fighting, get this book. It's all you need. The training methods in here are very, very good. This book covers on-guard position, tools(puches, kicks, etc.), energy drills, distance, timing, the five ways of attack, parries, target training, partner training... It's probably best for someone who has been exposed to stand-up fighting before, and has a basic knowledge of punches and kicks. It becomes a masterpiece when taken with "Jun Fan/ Jeet Kune Do Kickboxing" (which it often referes to), the "Bruce Lee Fighting Method Series", and the "Tao of Jeet Kune Do". Once again, it's probably not for begginers, and many drills require a partner, but that's just the nature of the beast. Good for sport/full contact, and pretty decent for self-defense.
Chris Kent and Tim Tackett do an excellent job of presenting the basics of Jun Fan Gung Fu and Jeet Kune Do concepts as well as a variety of useful drills. I highly recommend this book to any JF/JKD student. My only complaint is that there wasn't much about stance or footwork, which are the basis for everything else. In their book Jeet Kune Do Kickboxing they cover bai jong, the basic stance, for about a page and a half, but you could probably write an entire volume on the stance and footwork alone. If you're studying under a qualified Jun Fan / JKD instructor you'll know all of this, but it would still be nice to have a reference on it, and I'm sure that Sifus Kent and Tackett could probably offer quite a bit of insight into what is, IMO, an incredibly important, if basic subject.