I am big fan of chartmogul and baremetrics but this one looks really promising by its look and feel and ease of use. You can fix goals of growth day by day and you get a daily reporting by email about the performances.
A lot more feature to analyse churn, new MRR more precisely.
Also I love the fact that its free and forever ! (which can totally change the game)
Engagement metrics upped the game in Saas metrics for sure.