A couple of my friends came up with two of these planes and were flying them from around the old pit area. Quite hard to spot where the pilot is as they fly them from quite a distance away. My buddy told me at a stage the plane was over 800m away from where he was (GPS telemetry). They fly them using goggles that show a video feed of what the plane sees, out of visual range. It's quite high tech stuff, and the results a pretty cool.
@Michael Broom - no problem, will pop you a mail.