The extension always gathers basic information about the users: E-mail when downloading the extension, moves inside the market, clicking links, current amount of active users, and so on.
In the admin center you can get a part of that information (analytics is always refilled with new information).
The basic information (including building diagrams based on data) on package installation you can find in Dashboard.
However, you can find more detailed statistics in chapter Statistics (the chapter is also going to be refilled).
You can contact the administrator if you need extra information that the admin center does not contain.