I like the way that Retargeting captures my customers, and their actions, and then delivers a personalized message to them. I dislike the fact that they have no way to know if the message was actually read. This is a big problem for us, because we want to be able to deliver messages to our customers based on the action that they took. We have to rely on their self-reporting that they actually read the message, which is not always accurate. We are solving the problem of delivering targeted messages to our customers.