I have actually, and I see pros and cons to both... The glidecam has more of an organic movement and I've become quite good at using it, but the ronin has much more "crispy" movements and would be better than the glidecam for shooting closeups and shots when I need to run with it.

Thank you all for your replies! You've definitely given me food for thought.

I've rented the A7S a few times for projects in the past, so maybe I'll rent the GH4 to test it officially and then decide after that.

That's actually a good idea, and I'll have to keep my eyes out for a C100. A good friend of mine has one and he loves it.

Hey man, do you have a place where some of your work is available to listen to?