I would suggest not taking Lumifer's description of his initial impression of the sign-up page as indicative of the app itself. I think there's sufficient evidence of Lumifer being not unbiased in describing Intentional Insights content. So consider checking out the app itself.

Here are the study proposals themselves, which you can evaluate yourself for whether they are A/B split testing: 1, 2.

EDIT Forgot to mention, my comment on the nature of NancyLebovitz's question had to do with my own desire to signal that this is a very important question to me, not give praise.