Totally agree with this. I've been driving 4x4's for nearly thirty years now, and to jump in behind the wheel of the D4 was mind blowing.
Having done Gordon's course was probably the single best investment I've made with the car I think.
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Almost forgot, Gordon runs a classroom based training session (brilliant) which you should do first and where you learn about the systems. Even if that is all you do, it will open your eyes up to how capable these cars really are.
After that if you have time/money/opportunity you can go onto the several different car-based offroad training days where you get to apply what you learned in the classroom. Enjoy!