I've been using a CX190 for a couple of weekends now. It's proving to be a great little camera but these are a few things that you might want to consider.
There is no filter thread. You need to epoxy a step ring to the front of the lense housing to fit a wide angle lense. I used a 30mm to 37mm step ring and 2 element Raynox wide lenses (heavy) and it's been spot on.
The Hypeye D Pro works perfectly, as long as the flip screen is open. As the screen is rotated, when you turn the camera off then on again using the hypeye, the displayed images are in reverse, as are the menu items because once re-activated the camera doesn't know the display is flipped. It takes a few minutes getting used to navigating the menu backwards but isn't a problem
One big plus is the joystick control. After having touch screens on my last few cameras, I find the joystick is faster and easier to use.
The CX190 has electronic image stabilization and you can run it in active or standard modes, or turn it off, but either way, both modes worked perfectly in freefall. All other functions like focus, white balance etc.. can be set to manual control.
It's a sweet unit for freefall.. once you do the step ring modification.