I was interested, though, so I downloaded the app. The only option is to use Facebook to login. They say they've done this in order to cut down on the time it takes to launch the site, and will add an alternative later. Unfortunately that's not good enough for me, and I won't be using Facebook to login.
It seems really odd to lock the app behind a login anyway. Why not open it up and ALLOW (not force) people to log in? If you're trying to attract customers, let them use it! Don't require them to download an app and create a login before they even know if it's worth it.
Zillow does this well. You can use the search and see the value of the site right away, but you don't have to log in unless you want to start favoriting homes and saving searches. These features are useful and it makes sense to me. This just seems like poor planning for launch.