Hi!
I use a old version of a Cavision system for my 5D3 rig, the purpose is to have a Mattebox, FF and other possibilities of a rod system. But is it fast, easy to use? No, no, no. It nearly sucks, the matte box is stuck, the change from shooting stills to mount it back to shooting video is taking far to much time.
The rig:

What are you using? I'm looking for a system much like previous Zacuto settings. Easy of use and fast to go from Video to stills.