I just noticed a cool security feature on the B0 ballhead. It is a screw-type clamp, and if you unscrew it with the camera plate in it, it will only unscrew a little way and then stops. Where it stops, you can move the camera plate side to side, but only to the limits of the pins on the bottom of the plate (keeps you from sliding it out sideways inadvertently). You can unscrew those limit pins if you want to be able to slide it out sideways, but I'm going to leave them in for the security. Then, if you want to remove the plate from the clamp you have to pull out the screw knob against a pretty stiff spring before it will rotate far enough to let you get the plate out.
If I recall correctly, my Markins and RRS ballheads had the side to side security, but no stop on the knob to keep you from unscrewing it far enough to drop the camera. I think that's a good idea on Benro's part.