We've had excellent experience with slack (~120 users). Outages and incidents happen but have never shut us down. We built our business operations on slackbots

We've had excellent experience with slack (~120 users). Outages and incidents happen but have never shut us down. We built our business operations on slackbots and it works. It's not problem free, and slack is absolutely not innovative, but it's been solid for us since 2014.