I'd love one but was a bit put off by the heavy barrel distortion. I've got a 550d at the moment on an 18mm lens (not taking into account the 1.6x crop factor) but was drawn to these for the 2.7k resolution/faster FPS at lower resolutions and the weight of the unit. My AV130 with the skyline in struggles to tilt up and down smoothly without juddering with the 550d in.
Hmmm just watched the preview video for the black again and it does look ok in some shots. Does 1080p and 720p look much better in terms of distortion?
Would be seriously tempted by your offer, just don't want to jump in without finding out everything first! Guess I could always stick it on ebay again.