Man, I just got that Opteka GH1 (http://www.amazon.com …al-Supports/dp/B0071BIQZC) gimbal, and wow, this is so much better imo, to using my ballhead!
This is so much easier to pan/angle the camera now, and feels much safer/more solid than my ballhead. It is a tad heavy, but I feel it will be worth it. I can always use my ballhead still for a smaller/lighter option.
It is slightly stiff, which some said to use some machine oil or something to loosen it up, but it's not that bad.
Overall build quality is solid, and it's very very well balanced now with my 150-600 and 60D. Even without locking down the knobs, I can have the lens pointed almost straight up or down and it doesn't creep. Or if it does, its like 1mm every 3-5 seconds. I need to use it in the field yet, but so far, I'm quite happy.