I've installed this gimbal for use with my GoPro on the QX3, and it's working, except that the range of pitch is too restrictive. It's supposed to be able to look straight down, but it can only look from about 15 degrees above horizontal to about 60 degrees down (if that). I've seen video of them looking straight down and beyond.

I'm running with a DX7 Gen2, and the AUX2 travel settings don't help -- lowering the settings restricts the range further, but going above 100 doesn't expand it.