This plugin hasnt been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
I was searching for a plugin that would display when users last updated their profile and this plugin does exactly that as a column on the Users list. But this plugin could better if it could display the "User Last Modified date" on the actual Profile page...like maybe have it display under Account Management, above the "Update Profile" button. Regardless, this plugin does what it says and I rate it 5 stars.