A friend booked a place that turned out to be a double listing by a scammer. She caught it quickly, signed up for their insurance and got her money back. It is a good idea to make sure there is only one listing for the property. Make sure there are many reviews. I try to verify the owner of the property. Often times this cannot be done until after the booking is made and I get the address.
I have not used them since they raised their fees. I will occasionally find a property that is listed on both VRBO and Airbnb, and the total price has always been cheaper on Airbnb. It is my favorite website for unique, memorable, affordable lodging options when Skyauction does not work for me.