I do not have an experience with another tool to make it directly comparable, but as a non-pro user found it really rather complicated to navigate between accounts and subscriptions. Additionally reporting from Mixpanel is highly limited, ie. report output is not customizable, I would need to check each user individually to clarify which subscription they are on, Chargify lists only the amounts paid. Furthermore, there's no way to know from Charfiy if the user canceled the subscription, have to wait until the renewal date and see if the renewal is for the same amount as in the previous month or less.
Makes reporting and projecting quite a headache. Review collected by and hosted on G2.com.