Just ordered one of these bad boys. I'm now using only my Canon 5d MKiii for both vid and pics.
I have a kino ring light on it (with heavy ballast) and a big ass EF 24-70 lens along with a SmallHD monitor and an external microphone.
At the moment I have it all mounted on a SHAPE Paparazzi Pro rig. And the whole thing weighs in at about 10 to 11 pounds.
It's KILLING me to hold that, keep stable, try to pull focus, etc. while shooting a scene (which can take an hour and half to 2 hours with stills and vid)
But check out this bad boy:
http://www.albacamerasupport.com/
The Ready Rig really looks like it's the answer to what I need. It will arrive on Friday Feb. 8th.
Watch the 2nd video on the page where he demonstrates all the things it can do.