What does the company do well? Contact Monkey does a good job of tracking what happens to an email (or doesn't happen) after it is sent. It will show you when the email was opened, what device/location, etc. It will also show you when someone has clicked on a link.
What does the company not do well? The biggest thing that the product could do better is display which email address is associated with an open when an email has been sent to multiple people.
What do you wish you had known about the company before using? I wish I had known that it wouldn't distinguish each particular person's information on an email to multiple people.