As highlighted in previous reviews, this ball is paramount for optimal use of gorilla pod. Firstly because you are then equipped with a shoe that will allow you to first carefully attach the tripod gorilla on your medium of choice, make sure (sometimes twice a day!) And his good behavior only then to fix the camera with confidence. In addition, the gorilla pod is quite painful to screw on the device itself hoof savings you screwing / unthreading. And finally of course because the kneecap allows you framing / easy alignment.
So great product! The only downside being that the final cost of the patella couple + pod is quite important, especially when one thought he could manage without the help of the ball (which was my case).