I had one for Paradise Island Beach Club in the Bahamas until this past year. It was inexpensive and I sold it 7 years later for what I bought it for. It worked out fine for us because it was easier to trade a Caribean time share. (There was a one in four rule: one trade to a caribean location every 4 years unless you owned there.) I liked trading to other tropical destinations. I sold it this past year because I don't think it will work for us anymore with 2 small children. It sold fast with no complications.
My exchange company was Interval International and they were easy to deal with in my experience. You could bank up to 2 weeks and use it in one 2 week trip if you wanted.
My view on them now is you can find great deals all the time to most places using the internet and you don't have to plan so far in advance.
