I'm considering buying this new quadcopter.
Here's a Nice review of a 3D quad copter with Collective Pitch, only one drive motor, and belts going out to all four blade pods. Looks pretty robust.
interesting concept of the mechanics............and then you now get 3D capability.
Not a camera platform but more a Pitts Special Bipe quad copter.
HobbyKing Assault Reaper 500 Collective Pitch 3D Quadcopter Review - RC Groups
Full stunt quad copter....with collective pitch.......to fly out of the box......and fairly cheap.
Been flying fixed pitch quadcopter and helicopters for years. This is a new level.