I saw mark talk once and he is an amazing man. I wanted to check out the app and learn this practice. Its a great practice and I recommend that part, but the whole app is one, pretty poorly constructed app that includes only one video that you could probably see on you tube. It doesnt seem to qualify as an app to me and I was left feeling a little ripped off for paying for a YouTube video. Support mark, but maybe if it were .99 or had some other features it would be more worth it.
Cguthrey about iPromise