In general, trading with II is not the most cost effective way to us a timeshare with Staroptions, because they are more expensive to buy, and you get more value using the Staroptions in Vistana, where there are higher quality resorts.
You can acquire Vistana deeded weeks at most of the Flex Option resorts for free, or nearly free, on the resale market and use them for II traders, at a much lower cost.
Many Vistana owners have timeshares with Staroptions, that they use in Vistana, and timeshares without Staroptions, that they use for trading with II or RCI.
I used to own a 2 bdm. at Sheraton Vistana Resort, but gave it away after we discovered that we don't like the Orlando weather, and I still have a 1 bdm. at Sheraton Desert Oasis that we will keep for trading in II and RCI, and spring training, and also a 2 bdm. on Maui, which we use or rent - too expensive to trade.