I tested the spherical lightweight tripod on heavy tripod and monopod paradoxically on BUT not the Gorillapod tripods ...
I am pleased with the delivery.
----
March 2012 - Small problem
After longer use, I find that the push button of the claw locking the clip-plate eventually hang the point of having to unscrew the unit from the ball, especially in cold weather (-15 °).
A metal retaining plate, located under the push-button, buckle and eventually leave the lock deflect its axis.
Mr. JOBY two screws prevent the plate to take the game!
The irony is that I love this joint. I will proceed to DIY recommended to Mr. JOBY and if I miss my shot, I buy another.