Bruce Dorn with IDC Photography has ben shooting video with the 5D Mark II since it came out in 2008. He is a Canon Sponsored shooter and gets the gear before anyone else. He also was the first to design a bottom mount plate for viewfinders. This was designed for the troops shooting with 5D’s in combat. He has been making really nice support gear for HDSLR’s and is a great source of information. Check out Bruce’s Blog Here.