Right now I am trying the Manfroto HDV701. I think it's very smooth. The only problem I have with it is with the quick release plate. It's very big, and it's designed for a camcorder that is oriented in the opposite direction. As a result, it must be mounted onmy E-PL1 along the lens axis (front to back). It would not fit with a big lens (I suppose I could use a spacer to make it fit). Also, because of its orientation, I would not leave it on the camera. Hence, it's not really a "quick release". Anyone know of a better fluid head?