If you ever done product support you know that it is at times difficult. But mostly, it is very rewarding.
People who take time to contact support are often passionate about the product. It is conversations like this that make my day over and over again, and this is why I love doing adaptiveblue support on Skype:

If you are a CEO who never tried doing product support, I highly recommend it - you will never think about your product and customers in the same way.