A brilliant plugin for managing groups of users

I wish I had found this plugin before.

We segment our users into many different types of activities and capabilities. These segments need to be flexible as users can move between groups as they progress through various levels, or as they move into whole different sets of activities. The Groups plugin achieves all this with ease, either through the users admin page, but primarily through hooks to automate the transitions.

Previously, trying to achieve this with standard WP functions was restrictive and complex to maintain. Many thanks to Groups.