Assign UserGroup Timely
Assign UserGroup Timely plugin allows your website to have power of upgrading users access level by changing their user-group after a time period. Like initially when a user register at your website, he will be assigned 'UserGroupA'. Now you want that user should be upgraded to new user-group that is 'UserGroupB' after 1 week (7 days). This is perfectly possible with this plugin. You can assign unlimited number of user-groups.
Ulimited Upgrade Level
You can set as many as UserGroup level upgrade you want. There is no restriction for number of upgrade level setup.
You can send the email to predefined email addresses on level upgradation of a registered user. Notification to user is not provided yet, It will be in next release.
Multiple UserGroup Upgrade
This plugin currently would not work if a user has been assigned multiple UserGroups. Next Release will include this feature also.