any first hand experience of the Varizoom VZ-ZGRIG ??
 

Hi there, I'm wondering if there's anyone out there who has used, or heard of anyone using this product:

http://www.bhphotovideo.com/c/product/616857-REG/VariZoom_VZ_ZGRIG_VZ_ZGRIG_Zero_Gravity_Rig.html
I'm very much considering it for my shoulder steadycam option for a documentary i plan to shoot over the course of the next year. I can't find any review or first hand testing online anywhere! It will be for an canon xf300.

any help is greatly appreciated!