Personally we use slack at work and it's a terrible product. Yes it's nice that we can see pictures and gifs inline with the text but the client is not great.

Personally we use slack at work and it's a terrible product. Yes it's nice that we can see pictures and gifs inline with the text but the client is not great. The mobile client is even worse. The bloody thing just doesn't work. I'll get a message via the desktop app and 10-15 minutes later get the push notification on my phone. Then I can only see some of the push notification on my phone and when I go to click the notification to read it. The entire channel or DM it came from is not up to date. So if I do have service which I may not have I have to then wait for the messages to download and for it to reconcile what has been read. Any irc or xmpp clients do not have these issues. products like Whatsapp and telegram don't have these issues.