Pendulum-style Camera Mounts

Here's an interesting idea... a pendulum-style camera mount, where the weight of the camera is counterbalanced by the weight of the battery.  I've found two models, both of which have lots of videos  and details at the links.

Here's the ECILOP EASY.  It seems to be the original design (RCGroups thread).







And the Glyder 600 from FoxTech (RCGroups thread).