Yes, the G3 gamser is much more precise than the cell phone but still the camera control is not smooth but jerky and too fast. Also the yaw control is similar which is too fast and twitchy.
The forward pitch even with very slow movement of the stick, it will dip hard before settle down. As for the goggles, it is adequate and give you option to switch between the Breeze /phone cam, which is very nice. Note you must stop recording before you can switch to your phone cam though.