This plugin has been perfect for our project. With a growing membership, we need to create subgroups and invite members more and more often. Invite Anyone has made doing so a snap.
One note: once the Invite Anyone dashboard loads, doing a browser page search for a user's name is even faster than using the built-in search box. In fact, it would even be nice to have classes around the two left-navigation "blocks":
Search for members to invite
Select members from the directory
Then, I might hide the top box while adding content before, like: "Use your browser to find a name in the membership list, below."
Thanks, Boone et. al.!