Not just JIRA; I think a lot of people were burnt by Atlassian's management of Hipchat or Bitbucket too.
Historically there's something of a track record where Atlassian is the place where interesting, innovative products go to stagnate. Bug fixes happen glacially (a 1 year turnaround seems to be standard), and new feature development doesn't happen at all. Running Hipchat is like looking through a window back at 2012.
> Very happy for the folks at Trello. Great outcome for a great tool.
Great outcome for a great team? Perhaps. But I don't really see how this benefits the tool, nor the people who use the tool, because I (and a lot of other people here) are assuming, with reason, that this deal heralds the end of further development of Trello.