We've been using 0.9.2.1 now for a month and it seems to go well as expected. Some new features are added especially the group management. In fact, groups are always there but there were no way to manage them. Now you can add, edit, delete groups, and add members to them, right from the Dashboard.
Download 0.9.2.1 : http://code.google.com/p/ci-cms/downloads/list
To install or upgrade just run http://yoursite/install