A few weeks ago I showed both the CAME-TV 7800 and only a short glimpse of the 7500. The 7800 is ready to go out of the box, while the 7500 needs a bit of assembly. I finally had time last night to put it together and set it up for my GH4 with Rokinon Fisheye Lens.
The camera and lens combo i'm using was too light and didn't sit far enough forward. I needed to add a QR base plate system to add more weight and allow the camera to be pushed more forward. Because of the plate I had to remove the top bar and relocate the Camera IMU sensor. After recalibrating the sensors and balancing the camera, she seems to be responding really well.