"I would like to compliment you for your assistance and patience. It is so refreshing to work with a vendor with customer service such as yours."
"There is not a person I would rather recommend to someone than you. Boy, if every support person was like you, people would have to learn to speak without curse words, the average blood pressure of users/customers would drop significantly, etc.. I'd be more than happy to talk with any potential users (of TALtech software)."