These "preview" offers can be a fun way to see different resorts and locations, but look for:
1. Might have to pay part of the payment upfront, with the balance payable when you book the stay.
2. Room size will usually be a studio - if other sizes available, might be offseason or Sun thru Thurs.
3. Limited availability.
4. Usually requires participation in a 90 min timeshare presentation, which spouses must attend.