You might want to check out the new SC Merlin (http://www.steadicam.com/handheldmerlin.html). It's going to take some practice but the thing feels good with the HD100 and works with a feather touch control from your second hand. It's mot meant for mattebox and extra battery but that being said, with the motion of Steadycam shots and the relative brevity of them, I'm not sure a mattebox and extra bettery are essential. We use the Glide and Steady when the shot calls for them and then it's back to conventional when the matte and bricks go back on.