You can get the EXACT SAME ONE directly from the company for sub 5000$
Name is Mikrokopter, model MK-Hexa. Here in kit version, requires a 6-7ch. radio system.
Add to that a head-tracking system and use a 9ch system:
And a 2.4Ghz remote cam:
Helmet-mount the receiver, and bam! You got something that is instictive, keeps GPS coordinates, altitude and heading by itself, has a "return home" feature and other goodies like that.
All for less than that Madbull thing.