[JimmyL]

Do you find them that much better? We're a small HipChat-using company who moved three teams over for a month, and the communal response was "eh?". It's no-doubt prettier and easier to write integrations, but for the core competency of chatting, the two were very similar (and most people preferred the native HipChat apps to the Slack browser one). It's big selling point for us was integration with Google Docs, and in testing we found that it didn't work that well.

It's also 3.5x more expensive. In absolute terms that's not much (<$400 a month), but no one could point to $400 of incremental value in it. If we fully embraced it and turned off emails for those teams, would we see it? Maybe, but we'd still need emails to deal with external vendors, and there's no way that we'd get non-developers to see it as an email replacement.