I played with it as well. Very impressive. However, don't forget that the demo rig was flying only a lightweight DSLR camera-w-a kit lens, with no external battery, follow focus, or wireless video transmitter. It is going to be bit of a different experience-w-a Scarlet or an Epic, once you add the weight of that sort of camera, a cine lens, external battery, etc.
Since I own a RED, I asked the guys at the booth if I could handle the M10 that they had fitted with an Epic, just to get an idea of the weight. Apparently, the M10 fitted with the Epic was just to "look at," since the answer was, NO. Hmmm.
Still, I think it is one hell of a product. A bit pricey ... something that the Chinese will remedy in the not too distant future.