Super admin feature?

Hello Everyone,

We are outsourcing a bunch of wordpress sites (MU) to a freelancer. As a precaution we want to maintain a higher level of control and yet allow the freelancer to be the admin. This way if the freelancer disappears or changes the password, we can login as super admin and change the credentials.

Any thoughts on how this can be done? Any feedback on Extended Super Admins plugin?

Thank you,