I like that it integrates easily with Slack which is the main communication tool in my organisation. Using Slack commands I can start meetings. What is more those meetings don't require that much facilitation from me - most of the work is done by the tool, notes are published after the meeting and action points are tracked.

Perfect integration with Slack which accelerates greatly first sprints without a need to setup anything.

I love the dynamics of the "session", I know about our progress, I know who are we waiting for, I can see everything changing in the real-time - it helps me to get the most out of the entire retrospective experience.