Advanced tracking options gives you real-time statistics about each campaign: You can see exactly who opened the e-mail you sent, which link(s) they clicked, who edited their profile, who unsubscribed, why people in your list unsubscribed and much more.
An important number is the Click throughs indicating how many subscribers clicked on a particular link in the e-mail they received 1). Because you can see exactly who clicked a particular link, you can even export that list and send a physical mail to those subscribers with an offer on the specific product.
The system also gives you an overview of hard bounces, i.e. mails that can not be delivered because the e-mail address no longer exists or because the e-mail address is incorrect.