Honestly, I love Slack. It's so useful for communicating across a remote team across the planet. Because we have Zoom we don't bother with the huddle feature very often, and on occasion an update will throw a monkey wrench into the way I'd been using it, but the reality is that I can't imagine life without it, and that tells you everything you need to know.
Https://simply-b2b.com clients are added to slack channels to help us engage and assist on a daily basis. We also use this to manage our affiliate network
I love all the flexibility to extend the platform with custom emojis, bots, so rich. The recent app GUI refresh made it a bit easier to find what's relevant and what to ignore
Easy to use for simple tasks and startups. Once the tasks become more complex/ more groups etc it is not always clear to keep the oversight/overview once you are in different channels/ conversations.
Slack's user-friendly interface and organized workspace structure make it relatively easy for teams to adapt and start using it efficiently. The desktop app for Windows, along with desktop notifications, keeps users up to date.