As a property owner I have tried to find an effective way to get my property in front of shoppers. Many sites take your money up front and then never do anything to promote the rental. That has resulted in no traffic to the page or inquires. NONE.
I have been using VRBO for 3 months, have 195 hits on my property with to date 9 inquires. I don't pay until someone rents.
That's about 1000% better than what anyone else has to offered.
So all you who are trashing this site, please tell me what site is better. No site with multiple advertisers is going to be perfect; so who do you know is better? I will use them too.