After years of great experience renting high demand weeks at a highly sought after Marriott resort, at a very reasonable price, we've had an awful two or three years with Redweek.com. Further, we've never had good luck with Koala or Vacation Candy, or for that matter the TUG Marketplace. In my opinion, Vacation Candy is unscupulous, they tried to pull a fast one on us, a few years ago, and got caught.
I did a lot of research on the challenges that we encountered, and it seems that we developed the challenges that we did, when Marriott Vacation Club started dumping their inventory for rent into VRBO or AirBNB. We have no experience listing our Marriott villas for rent on VRBO or AirBNB, so I can't say that we went head to head with Marriott, with our villas for rent, on VRBO or AirBNB. I am told by a very reliable source, at a large Marriott Vacation Club resort, that a lot of their guests are VRBO or AirBNB clients/guests/renters.
Ironically, we kept our rentals listed on Koala, even after they were rented, just to see if Koala produced a customer, and 2 weeks prior to our check-in date, Koala produced a customer (for the first time, ever).
My gut sense tells me that the American Customer of Today, thinks first of renting their vacation accommodations from Marriott (directly), or VRBO, or AirBNB. It seems that the consumer has the highest confidence in those three brokers, and their (reservation) technology appeals most to the consumer.