Meal vouchers are certificates that entitle you to either breakfast, a "quick & casual" lunch/dinner at a counter service restaurant or a sitdown lunch.
The prices range from $11.50 for the Q&C certificates to $31 for the sitdown lunch certificates when purchased thru a savings club like Hotwire or Connections123. The cost covers the meal, tax and gratuities. Whether they are worth those prices are dependent on where you spend them and how.
Some people like the convenience of pre-paying for their meals. Some feel that they save money by purchasing the certificates and then splitting the meal provided by one or more persons. Others find little to no savings in using the certificates and do not like being limited to the restaurant choices.
Just like the onsite vs offsite debate, it all depends on what you consider to be a "value".
HTH