I don't totally agree with this. Some fixed weeks are awesome traders, some are dogs. I am currently looking to buy a fixed summer week in the Outer Banks, NC. It is a place we'd love to go each summer, but it is really hard to trade into. Conversely, it is a super trader if you trade out.
I've owned a fixed summer Wyndham week in Williamsburg, Va since 1985. I have used the heck out of that thing. We have gone on so many wonderful trips over the years that we couldn't have afforded any other way.
OP, you need to know the resort name, if it is Points or fixed week (which will give you a certain number of Trading Power Units or TPUs), and the yearly maintenance fee. Trading is RCI is $200 a trade now. You can get a 3 year membership for $249.
Next, you need to figure out what your cost per Point or TPU will be. Add up your maintenance fee, the cost per trade, RCI membership fee and divide by the number of Points or TPUs you will own. Then, check RCI to see what the places you want to trade into will cost in Points or TPUs. If it costs less for you to trade into them using your Points or TPUs than it would to rent, then take the timeshare. I often get 2 or 3 vacations out of my 1 timeshare week ( a lock off unit that I deposit as 2 units). It really makes timeshare trading cost effective for me. Timesharing can be great if you know how to maximize the system and get the most bang for your buck!
PS - My parents bought the timeshare for me with some money I inherited from my great grandma. It cost $3000 in 1985. I have saved waaaaay more than that and made some spectacular family memories in the process.