We did it once at Vistana. I had never done one and wanted to see what the uproar was about. If you are firm and clear about why it is not right for you to buy then they are not too unpleasant. They keep trying but then that is their job. We got two single day tickets to Disney which we upgraded at customer service to park hoppers. The kids got a few free hours of videogames while parents took the tour. The free breakfast was nothing special but okay. All in all I'm glad we did it but I wouldn't make a habit of it. The one caveat I have is do not do this on a park day because it takes longer than they tell you.