I was the person that first brought Slack into our company. I worked hard to get people to start using it and now it's used a great deal.

So now, I find myself using email more again. Slack seems to bring with it expectations of instant replies and lately I find myself preferring the more asynchronous nature of email. I do like that the Slack archive is generally open and searchable to all, but the interruptions suck. If the Slack client was silent unless it had focus, I think it would work better for me.