We LOVE working with you.
Mind if we brag a bit?
We are privileged to call you our client, and hope to continue the pleasure of working with you for time to come. As we've achieved some specific success together to date, we'd like to know if you would take a moment to share some of the aspects of our work that have been instrumental in this, so that we may share your story with others.
We appreciate your comments and the opportunity to brag about the success we've achieved together.