So.... gimbal fitted.
Have a gander at this little test vid ive stuck on youtube, gimbal is top notch!
Not so sure about gopro? its a white version filmed in 720p 60fps, then reduced to 30fps using imovie.
Footage seems suspect to me. It is the same in 60fps but obviously a little faster!
http://youtu.be/ueVwnbqHYC4