I did the one where you were supposed to get 2000 points and 3 days/2 nights at a Fairfield Resort.
My results???
1) I did not receive the points, even after emailing about it.
2) Was not told until after getting my paperwork in the mail that to get the 3 days/2 nights, you had to make more than $50,000 and go on a required tour as it was a timeshare. I am single and don't make quite that much.
3) When calling to cancel, I had a very long phone call (about 20 minutes!) w/ a very rude AOL employee cussing me out and telling me how stupid I was for signing up for it "just to get some free stuff". Of course he would never transfer me to a supervisor, and I didn't want to hang up because I was afraid I'd have to keep paying for it. I tried it out and hated it, so I did not want to keep it.
I'm glad everyone else had good luck w/ it. Just be warned that it doesn't always go so smoothly.