Hi Daniel,
the other component I am using is Joomlamailer. But even both together do not serve my needs.
What I would really like, is a C/M/P which does 2-way communication with Mailchimp, especially on the subject of users. I would like to import my users form mailchimp into Joomla, making them belong to a certain group depending on some field in Mailchimp (e.g. registered, editor, publisher, manager, superuser, etc... or any other handmade group that one can make). And vice versa, synchronize to Mailchimp the changes I make in the Joomla backend (or that users make for certain fields in their profile).
The Joomlamailer allows for mailing articles, events, etc to users through mailchimp, but your componenent doesn't. Yours however, provides two way communication on new userss/lists.
Combining both (being able to use all the features of mailchimp) would be tremendously useful to a lot of users, especially clubs (membership mailing can be send depending on segments).
So, in all, yes, reports, but also creating mailings, and ESPECIALLY, use segments or conditionals from and to Mailchimp.
Of course, a C/M/P with these functionalities can hardly be free (unless you're a masochist,
. So I would definitely be willing to pay for something like this.