I bought many alarm clocks in the App Store, but none of those were good enough to wake me up. So I was always late for class or work. This app is really working, there is no possibility to snooze, to close the app, and to continue sleep. Thats what I needed most. I really recommend this app for people like me, who are always snoozing and then finally wake up late.
Broutmebitch about SpinMe Alarm Clock - Guaranteed Wake Up for Deep Sleepers, v1.1