I purchased this and tried it this morning. It worked pretty well, I don't usually get up on the first try. I normally have to pound the snooze button. This time I actually honestly got up at my target hour. I hated it though, it was absolutely the worst.

Amazing app .. really gets me out of bed!!
Especially the Evil Mode - the snooze button gets disabled!! What more could I ask for?

LOL, I think this might make me throw a phone!