I did one of these, and the problem was they promised a cruise out of Galveston, and then when the time came, wanted to switch me to a cruise out of Miami which I didnt want.
They finally put me on a cruise out of NOLA, but they gave me a really terrible noisy cabin. Unless I paid to upgrade I was stuck with the very last inside on the bottom deck of Triumph and Triumph has a really bad vibration. I did the cruise .. but the cabin was awful. I would not do it again. It wasnt worth the hassle to save a few bucks.
PS mine may have been different as they were not selling a timeshare, but a vacation club.
Conquest 7/21/13, Miracle ALASKA 8/27/13, Miracle HAWAII 9/17/13, Celebrity Summit, 11/30/13, Celebrity Summit, 12/7/13, Celebrity Constellation, 2/7/14, NCL Epic 3/2/14, Allure 5/4/14, Allure 11/2/14, Quantum 12/8/14