Here's the issue, I've read multiple other articles saying the exact opposite: you should buy DF ads, you should buy ads on the iPhone review sites, etc. In th

Here's the issue, I've read multiple other articles saying the exact opposite: you should buy DF ads, you should buy ads on the iPhone review sites, etc. In this article they are staking out a position somewhat against the conventional wisdom and contrary to what they've previously recommended people doing. Given that context, I think it's important that they back that up with some data and a some description of their thought process.