You've probably seen taste tests on TV -- a group of people drink or eat a bunch of products with no labels and then have to choose which one they like. At the end of the customer survey, there is a short questionnaire using the Likert format. Then the labels are revealed to show what product the person enjoyed the most.
People who are loyal to other brands are perfect for taking these customer satisfaction taste test surveys. Since not only are you conducting a survey you are also creating new customers.