Admins using the app have a number of features at their disposal. Just swipe to the right to reveal the sidebar menu, with the Dashboard, Users, Groups, and Audit Logs sections. User management lets you add, delete, edit, suspend, and restore users. You can do the same with groups, as well as add members to a group, and email them all. You can also manage passwords directly from the app. Google Admin also lets you view Audit logs.
As an iOS user who manages a large Google Apps domain, this is going to be a great tool.