I'm using this add-on now for one of my sites. And yes, I'm getting users who are contacting me when trying to reset their password, letting me know that the email on file for their account is no longer accessible. Does the system show them what that old email address is without them being logged in? Or is it only displaying it to the user when they're logged in?
If it's displaying it to them when they're not logged in, via the password recovery process for example, that would be a problem. What's to prevent anyone from trying to login to another person's user account, which would allow them to see what email address is on file for that account? That's typically the one piece of information I can use to have someone confirm before helping them regain access to their account. Hopefully that's not how the system works.