"My conversion rate has skyrocketed..."
"I have two words about the sales letter. Mind blowing!"
"You're a genius copywriter."
"Business has been doing great. My conversion rate has skyrocketed ever since you wrote those sales letters for me. I can't thank you enough for doing such a marvelous job."
"You're the first person I'm going to think about every time I start a new project that requires copywriting."