A common problem is that people try to be nice and they don't want to hurt your feelings with their feedback. Harsh feeback can be valuable, would you pay $1 to hear it? P.s.: They said launch early, let's see how low we can go :)
I may be using it ~10 times before every release if I would be able to send a mobile and a text. For example: "I need feedback only related to the login/sign-up process"