Submitting this review in case this deal comes back, for other sumolings.
This is a very good tool, really polished.
The chat system is good. Nothing really surprising, it works as expected. The fact that you can easily attach files from anywhere is good. It's very convenient for teams. I largely prefer it over Slack.
But what I like the most is the task system. It's not perfect but it"s better than many task management tools. In conjunction with the chat, it's very convenient. You also have your own space where you are the only member and can use for your own tasks. So you have everything together, tasks for business and tasks for personal life. Great tool.