It's a great way to list a timeshare. It's easy to list, and it's free. I always list my weeks on Koala and hope to rent my weeks that way, but I have only rented a few weeks in the last two years. I have rented many weeks on RW, and I initially rented a lot of weeks on Koala, but it's been tougher lately. I don't know why, except I think the organization of the website should be more like RW. I don't want them to clone RW, but renters know about RW and Koala is unknown, so making it tough to find listings by resort name, it's just a huge mistake.
I am currently angry at RW so I wish Koala worked 100% of the time. But not even RW works all of the time.