I found the statistics sections of Sourceforge. 348,839 downloads of the official editions at the time of writing:
and another 55,000 torrent file downloads:
And add in more than 22,000 downloads of the community editions over the same period and that's quite the (potential) user base, and a fair bit larger than I expected. I mean seriously, we have the power to break at least 40,000 machines (assuming a very conservative 10% conversion)?
So the question is, do we need to do anything different to promote 17.0.3?