We switched to Flowdock and never looked back. The SNR advantages of the integrated conversation threads and "email-like" inbox model are amazing. I never knew what I was missing with IRC/hipchat.
Same here. We "inbox" everything from support, to social media shares, some analytics, as well as code pushes. Love the way Flowdock handles those items and lets you make reference to them while talking in the main thread.
Yep - the way that flowdock handles multiple "flows" and the nice simple interface was the selling point for us. Slack has a bit of a nasty interface that is just not "clean" enough.