I have a Futaba 8J and its a nice radio. From this forum, I discovered that you can get the left-hand control stick spring loaded so that when you release the stick, the craft maintains its height. I installed a spring and things worked well at first. After many flights, I suddenly received blinding red lights at start up. NAZA flight assistant showed 'Error 29' related to stick calibration. Despite many Tx calibrations, the error message stating that my sticks were not properly centred did not go away. Turns out that the way to get around this is to throttle to zero when connecting the battery to the Phantom (with the transmitter on of course). I don't know why this problem came up but would be happy to hear suggestions.