Nothing helps you make a sale like strong testimonials from satisfied customers. Prospects are impressed when they hear positive things from those who have already bought your product or service. Some types of customer recommendations work better than others.
"This is great stuff" is a good testimonial but, "This stuff cut my costs by 20%" is even better. Try to get customer recommendations that tell what kind of results the user got. When customers say something good about your business or products, ask them if you can use their comment in your marketing. Almost everyone will be delighted and flattered that you want to use his or her words. Write them down and file them away for later use. You can also ask a customer if you can write down a testimonial for them to put their name on. Busy customers will appreciate you doing the work for them. Of course, you will want the recommendation to reflect what the customer really thinks.
— Source: Kevin Nunley