It's free for landlords, tenants need to pay 25$ at the end of an agreement when the contract signed.
It's obviously better for landlords because even tenant screening for them is free there.
I use it now as tenant and site look pretty, everything is optimized, comfortable. Not so much property, but as I understood it's a new one on the market. This week gonna try this bidding system, sounds great. You can also check this.
In general, this website has nice perspectives to be something like Trulia or Zillow in future.