Quick tip, look up your business on yelp.com and see what your customers are saying about  you. This can be a great source of free feedback, and will enlighten  you to some of your strengths and weaknesses. If you aren't listed yet, create an account and add your business. You shouldn't review your own business, but you should definitely invite your loyal customers to give you some reviews. As a matter of practice, after you finish interacting with a customer, suggest that they leave you some feedback on Yelp.