I did zdk for a few years it is based on very traditional karate, you will see almost identicle kartas in other styles..
The bit I liked was that it also lent itself heaps of techniques from other styles, we actually went to boxing classes for a few weeks to learn boxing,, did muay tai aswell. lots of hand to hand and self defence stuff, we would have night club nights, mostly grappleing knees, elbows etc, but we would all gather around so we had limited movemets,, and we had quite a few weapons demonstators, SAS, instructors etc also
was really good, and yes was a great bunch of guys, you dont want to train with a pack of meatheads