Star Island Info
We own a week 13 at Star Island and were planning to either give it away or trade it in the next year. The largest Star Island unit are 3BR 2bath (there are no 4BR's). They are actually two bedrooms with a den.
Weeks at Star Island are fixed and cannot be changed unless an owner has converted their week to Wyndham points. There is no fee to split the week, and it will split into two-1BR units; one with a full kitchen, and one with a partial kitchen. However, both would be for week 13. You can stay for one week and trade the other. The resort sends a usage postcard each year that you can fill out, or you can call to let them know their intentions. Maintenance fees and taxes were right at $1000 last year. The resort is well-managed, is constantly upgrading and adding amenities, and has a regular replacement schedule. We have owned since 2004 and have never had a special assessment.
There are no affiliate resorts to trade with, so you have to exchange to go somewhere else. We have traded our unit primarily through II, and it trades pretty well, especially if you place a request about 6 months out. Some of our 1 BR trades include Marriott Grande Ocean for Easter week, Seven Mile Beach resort on Grand Cayman Christmas Week, and the Royal Cancun the end of January. Some of our 3BR trades include Vistana Beach Club Christmas week, a 3BR at Scottsdale Links first week of April (our spring break), Hyatt Wild Oak Ranch Christmas week, Eagles Nest on Marco New Year's week, and Hyatt Beach House Christmas week.
We bought our unit as a resale and have never felt like a 'second class citizen" because of it, whether we have visited or had questions and called. You can deposit you week with II (you have two years then to use it) or you can request first. Right now, I can request with both my 2017 & 2018 week if I so choose, without paying the maintenance fees ahead of time. You can't place it in SFX until you have paid the maintenance fees, but you can trade your timeshare there too.
The website listed in the OP has great information on the resort and available amenities and activities.
Hope this helps! We have liked the resort, but our kids are soon to be HS and college graduates in the next couple of years and we would like to own where we keep exchanging into.