Seth Godin’s book Purple Cow has a case study on Stew Leonard’s grocery store. Stew, the owner, had a comments box by the door. Whenever a customer put a comment into the box, Stew would personally write them a note to say thank you. On the same theme, I’m also aware of a very forward-thinking company where the MD writes a short note of thanks by hand which she puts in with every employee’s monthly pay slip.
Ask for feedback. Say thank you when you get it, whatever it says. Explain how you are going to act upon it (or not). Your customers are your best source of inspiration and growth. Plus, they are the people with the biggest vested interest in helping you be a success. Ask what they think. And remember to say thank you!