First thing I thought of when I read the article about the app was that if I'm sinning so much that I have to keep a checklist of what I am doing, then I'm not going to be the type of person going to confession in the first place.
Second thought was, there is no way on earth that I am going to be listing my sins on an electronic device that can either be lost, stolen, or hacked.
Seems to be a silly piece of software to me, but it did get its creator a lot of PR attention.