Compare with the big size multi rotors, the 250 is more and more popular. I do not know why so many people like them until i see 4 of them fly the ARRIS Xspeed 250 in underground parking.
It is really fun!!!!!!

4 ARRIS X-Speed 250 Fly in Underground Parking (1 min 12 sec)

ARRIS X-Speed FPV 250 Flight in Underground Parking (2 min 12 sec)

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This is the flight of the ARRIS M680 with Zhao Yun Pro Gimbal from http://www.arrishobby.com/index.php?...e158ab2803ef4b.

ARRIS Zhao Yun Pro Gimbal with Sony 5N Flying into Clouds on Jinding of Emei Mountain (4 min 6 sec)