On my first flight I flew the Vortex 150 for about 4 minutes. I landed on the ATV and noticed a burning smell coming from the ATV. I felt the motors and noticed motor 2 was very hot. I let the motors cool and then tried turning the motors on and running, but motor 2 wouldn't spin. I then returned it and ordered another Vortex 150 and after 3 flights the quadcopter would not turn on even though I could see the OSD. The quality control does not match that of other Immersion RC products.