The best features of Slack are its innovative interface and easy to use features. Slack makes it simple, and even kind of fun, to communicate with your coworkers quickly.
I like the different slack channels for various departments, tech-support, team, individual messaging, and celebrating my teams successes or helping each other out with account challenges.
Slack has been a winner for me no matter which role I am filling. Teams adopt it quickly it's easy to use, easy to set up, and has abundant opportunities for integrations.
While they are only visible to me, I am always worried that I accidentally posted something wrong.
I disliked the inability to make a public group "private" after it's creation. Would occasionally lag and my.
I hate hate hate how often I struggle with using the video share and audio when someone calls me on slack. It almost never works for me.