As much as I hate to agree with an Ames person, the last timeshare we would stay at in SW Florida is Golf Villas. It is merely an apartment complex in town, and not a resort.
I have been going to SW Florida, Ft. Myers Beach in particular, for 30 years, coincidentally while I was living in Ames. I have studied the availability in January for almost ten years, searching almost every day. I have recorded my last 3500 searches or s.:
http://www.tugbbs.com/forums/showthread.php?t=13540
I know many of the resorts intimately and the rest somewhat. I have my own ranking of them and have a book half-written laying around here somewhere.
With the exception of Seawatch on the Beach, FMB itself has several lesser resorts, some lesser than others. Some areas of FMB are quite congested and it has become a local motorcylces destination in recent years. We enjoy staying at some of the resorts and not at others. Most of them are not the lush models you see at the end of tours.
The nicer resorts are on Sanibel/Captiva and Marco Island.
The area itself is a beautiful area, one in which we intended to buy a retirement home, until all the other baby boomers decided the same thing and drove prices through the ceiling. People and congestion have become a serious problem as the infrastructure cannot seem to keep up with the growth.
Feel free to contact me by email or to post a list of what you see available and I will give you my ranking.