Thanks! Also I like your idea of being able to control what is being tested more.. will have to think about that.

To your point about much of it being outside of your control... this is true; however the little bit you do control (that tiny description) can make a big impact. I see the service as a way to test the limited copy of your app page.

As a side note... I ran a test with one of my own older (a quotes app) and over 50% of the respondents said they wouldn't pick my app because it was simply randomized quotes instead of categories (competitor) so I did get some insight as to what my potential user values more from a feature perspective as well.