I've heard plenty of complaints on the design - personally it never bothered me.<p>What I like about it is definitely the IRC-killing type features:<p>* Has the benefits of IRC (public channels)
* So many integrations! That's where IRC really fails vs Slack
* Smart notifications, including push notifications<p>Multiple organizations within one application helped me never turn on IRC, Telegram and Hipchat. I replaced 3 apps with one!