We have bought two timeshares in the RM, one at Fishermans, and one at Sunscape Tulum. We feel that we have done well at both places, and have spent a week each of the last two years at Fishermans. We have had no problems at all at Fishermans, even getting the suite we wanted both years. We are going to sell the one at Fishermans because we simply won't use that many weeks in a year, (we have 4), and will use Sunscape instead. Despite our initial fears and trepidations, I can honestly say that we really have enjoyed our experience at Fishermans.
Buying a timeshare is like anything else: You have to know what you want going in and you have to know that there are many differant deals out there, offering differant things.
Please feel free to PM me if I can be of more help as to our experiences. I found a really good website that gives info about this topic: http://www.crimes-of-persuasion.com/...ime_shares.htm