A couple of alternate solutions. The Sirui gimbal head is both lighter and less expensive than the Wimberley. The adjustments for friction are not as precise feeling as the Wimberley but unless comparing side by side not everyone will notice the small difference.
My last ball head acquisition was from a German manufacturer. It has the main knob for the ball, a rotating lock for the base, and a third one that allows adjusting the friction for travelling in a vertical plane only! I have found it handily supports a 300 f2.8 in this mode. It is still a ballhead so letting go of the camera and lens is NOT recommended but for size and weight it is a decent alternative to a gimbal head for occasional use or when packing light. Will try to remember to look up the make and model after work tonight as I just can't remember that right now.