Testimonials are probably the most powerful tool one can have.
I do believe he has some excellent information. If there were only one technique, method or application that would work, every marketing program would be identical to all the others. The only way to tell if any marketing technique, method or application is right for your product or service is by Testing, Re-testing and Testing Some More. In this case, it s simply your own testimonial. In this case, your sales letter would be mailed to that person s clients, along with his testimonial letter as to the quality of your system.