I've just built my first quad, it's a Feiyu Tech kit fitted with a kkmulticopter blackboard flight controller and it's almost impossible to fly. Every flight feels like a semi controlled crash waiting to happen, needing constant stick inputs just to keep the thing the right way up and I've given up on anything resembling a stable hover.
It's not at all like the various quad videos I've seen on youtube where the guy puts the transmitter on the ground and the quad remains in a stable attitude/altitude. The quad is also very twitchy, i.e. small stick movements produce large pitch/roll movements, not really suitable for a beginner, and to be honest I've stopped trying as even getting the thing into the air is quite scary.
Is this normal for this type of setup? I was looking for a stable platform to do some aerial photography but there's no way I'd risk putting a camera on this setup as it is. Would replacing the kkmulticopter controller with an Ardupilot Mega give me a flyable platform or should just buy a Parrot AR.Drone and hack my iPhone so I can record the FPV from that? I don't want to keep spending money on DIY kit if it's inherently unstable and I can't afford a DJI or MikroKopter setup.