If you have already mastered small jumps, can sail upwind easily and are thinking about stepping into the freestyle arena, then the expert course is what you are looking for.
You can book a 4 hour long course, which concentrates on the skill of your choice (see list). The course will be held in 1-2 hour blocks depending on the spot. At most there will be two of you in the group and the instructor will be able to use video-analysis to intensify the learning.
The material is also the best available. You will get the latest kit from North Kiteboarding, depending on your level (Toro, Vegas or Rhino) and the 5th element bar will also be available so you will be in absolute control even during "unhooked" manoeuvres.