EZ cam is nice because you can attach any video camera device to it. It has a "screw mount" on the top which will obviously hold any camera device with threads in the bottom.
We never use the "screw mount" part of the EZ cam because GoPro's don't screw-in and our Kodak Playsport sits too high on that mount which causes LOTS of vibration.
The other part of the EZ cam mount which we use for our GoPro is the "clamp" part. This will fit most devices. There is a flaw with this part of the mount, though. The clamp is fixed to an arm socket which allows the clamp to move in all different directions. It's nearly impossible to keep the clamp section in place during a set. We are constantly adjusting the position of the clamp. Also, because it's a hanging component of the mount, you get plenty of unwanted vibrations.
I think I'm just going to strip all the components of the EZ cam mount and attach a GoPro mounting plate to the top of the EZ cam unit.
Mike, feel free to give me a buzz if you want to know more about the EZ cam. We use it every time we ski.