I did the timeshare thing and actually ended up buying.Not sure if that makes me a good reference or not. Anyway, you have to consider the upfront cost, if you want to come back (I have never understood the buy to trade thing - we purchased because we wanted to come back!) the maintenance costs etc. For us, we purchased every other year but I don't know if they still offer that, it was a good deal and we do not regret it at all. It's not for everyone though.
Good points about Captain Morgans, I always find it friendly, it's maintained pretty well, the accommodation is fantastic and it has a casino if you are into that. Bad points, well, minor really - it's not in the town, you'll have to either take a boat, a bike or walk). For me that's about it.
Anyway, remember you are under no obligation to buy. If you like it and it makes sense to you then go for it. We went on a timeshare presentation to Orlando and HATED it.!! Captain Morgans is a nice place and well be on our 10th trip in November.