I purchased an iMac Pro a couple of weeks ago. I only bought the 8-core version, but I did boost up the video card. I know it's a closed system and I could had built a Hackintosh or a more powerful windows based computer, but I like the Apple Eco system and like the reliability (knocking on wood) of the iMac. I haven't had any major issues with the my old iMac and hopefully I won't with the iMac Pro. I am getting back into video editing, for I have take two college level courses in Motion Graphics (After Effects) and I'm self-teaching myself FCPX. I'm starting to dig FCPX and hoping in the months to come the dividends will start to payoff.
Here's my setup:
img-iMac-pro-003 by
John Pepp, on Flickr