Funny that this would come up. I trained with a good JKD instructor for a couple of years as a beginning marial arts student. What I was really interested in though, was the Filipino martial arts part of JKD, so I switched to Pekiti Tirsia and trained in that art for a couple of years. Later I learned another Filipino martial art, which I continue to train and teach. I still keep my hand in Pekiti Tirsia, however, as it is an excellent system.
If you are interested in Filipino martial arts, Pekiti Tirsia will provide more in-depth coverage than what is typically taught in a JKD school to beginners. Of course, this also depends on the school and the instructor. It has been my experience that JKD teachers with a lot of experience in Filipino martial arts will generally train in more than one system of FMA.
With respect to the empty-hands curriculum of Pekiti Tirsia, it is extensive and sophisticated. As you can see from the following description, (taken from Billy McGrath's Pekiti Tirsia website at
http://www.pekiti-tirsia.com/docs/overview.html), the empty hand techniques are based primarily on weapons techniques.
The general categories are:
1. Entry techniques and nerve hits - attacks that bridge the gap, coming mainly from knife-to-knife and single stick techniques.
2. Parry drills - coming from knife and stick drills.
3. Traps - coming from sword and dagger techniques.
4. Fist, foot, and joint breaking - coming from knife and single stick.
5. Locks, throws, takedowns - mainly coming from hand vs. knife.
6. Leg work - [kicks, stomps, leg traps, and "foot clearing" - parrying kicks with the lower leg ] - leg attacks and counters to kicks coming from knife vs. emptyhand counters and the older "silat" techniques of the Majapahit Empire period.
7. Ground work- wrestling and strangulation from hand vs. knife.
Best,
Steve Lamade