On what seemed to be the final button click, I got an error message. Perhaps clicking that last button should result in the button somehow indicating the app is processing the results so that people don't click the button again.
To try it I have to login, eesh. I wish that weren't the case.
I also wish the prices were per request or for a certain time period. This doesn't feel like something I need to subscribe to, rather it is something I need to use only when planning a trip and I'd be happy to pay a one time fee for that.