We received a letter from Sheraton saying that we could stay four nights five days at Sheraton Vistana Villages in Orlando for $279.00. Has anyone else received this letter? i called and they said that it was on the up and up. They said it is because we are faithful customers and they send them out every once in a while to reward us for staying at their properties. Sounds to good to be true. Anyone else ever hear of this? Should I be leary?