I've never heard of it. Remember that any timeshare rental company needs to have timeshare owners offering to rent their points/reservations. They could even advertise places for FREE, but that doesn't mean they actually have it available.
Just a reminder to please remember when posting about other websites, unless you know from previous experience that it is not in our board filter, to post an actual link. While Go KOALA isn't in our filter, if it were, the software would star out the link. meaning that that website could not be discussed on the DISBoards.