It's not actually vouchers, you have to buy the plan for everyone on your reservation for the entire duration of your stay. And from what I understand, you can't use a meal allocation for another person, like you could in the past. Meaning if you had a friend with you who was not on the dining plan, you can't use one of your meals for them. I am not 100% sure that is accurate, but I remember hearing something to that effect on one of the more informed vloggers YouTube videos when describing the changes to the new plan.