GAUI makes some really nice quadcopters that are surprisingly affordable considering their high performance.
The Gaui Quad-Flyer was designed based on military grade UAV development , which emphasizes the advantages of: Flight Efficiency: Standard Battery) time of flight for more than twelve min, with a high capacity battery, the flight time will be more than twenty min or more. Excellent wind resistance: the efficiency and load of propellers are perfectly optimized, so the wind resistance will be better than general electric aircraft. High stability: contains GU (three axis stabilizing system) for the beginner or the FPV flying, it is a very stable Vehicle. Additional payload capabilities: payload up to seven hundred grams (including battery), can freely install cameras and video recorder, and other general system. System Extensibility: can be used with GPS positioning system and navigation system on the Quad Copter without any change. Operation mode and flight characteristics with the same helicopter, but no complex transmission. Collapsible body design, greatly reduces the damage rate, which can be repaired easily without adjustment.