Campfire and Flowdock are both pretty awful compared to Hipchat (the previous market leader) and Slack. I think Hipchat is feature-wise mostly on par with Slac

Campfire and Flowdock are both pretty awful compared to Hipchat (the previous market leader) and Slack. I think Hipchat is feature-wise mostly on par with Slack, but has a much more approachable interface. Hipchat is also learning from slack on how to make integrations easier to install and configure. Slack surged into the space by marketing to companies that were using nothing - not by winning people away from competitors. I'm not sure that Hipchat can take the space back from slack without a major new killer feature, but Slack's marketshare is hardly guaranteed.