Here's my take on it:
Crazy? yes.
Adrenalin junkies? ab-so-f******-lu-te-ly.
Reckless: not nearly as much as you would think. I've seen some of the planning that goes into the more complex jumps like big-way RW, freefly and CRW. Lots of "dirt diving" (rehearsals on the ground) thorough briefings and debriefings and plenty of practice before going for it. This sort of stuff can get very technical and is not for the amateur or reckless.
The Kudu spin video has a three page thread about it on a South African forum named Avcom, including posts by one of the tandem instructors featured in it. I managed to read it through Google's cache functions. It was an accidental spin. I could armchair quarterback about it lots, but I'll say this: they let their speed get *way* too low, had inappropriate control inputs, and about as miserably failed their recovery procedures as one can short of hitting the planet.