My husband and I studied a system of Tae Kwon Do called Ji Do Kwan, long ago. This system had a patch that looked like a smaller red ball balanced on a larger red ball, the whole thing outlined in a dark scallop.
This system's speciality was aerial (flying) kicks, and it had different Forms than I have seen since. It was a very strong hard style, and we broke boards often. I was always surprised at how well the techniques really *did* work.
I agree with LordTrader that the whole style seemed based on distance fighting, and offered very little in diversity of movement, and close up entanglement.
We added a Chinese soft style later, with a different teacher to fill in some gaps.
We decided the best has to be Korean legs with Chinese hands, covering both hard style, and soft style.