I have used the Sleep Machine app for the past four years and loved it. Unfortunately, that love relationship has changed significantly with the "upgraded" version of this application. In an attempt to make the app more robust, the "tinkers" have added an additional sound option into the mix, and some other goofy sleep cycle calculator. The result of all their "improvements" is that the app functions equally as well as a sound generator, but is no longer reliable as an alarm. I still use the app, and have been trying to figure out how to work around the new glitches. For instance, it now will randomly turn the alarm off in the middle of the night. I cant figure out why it is doing this, and have tried several ways of assuring that it stays engaged…thus far without any success. Also,The snooze button is no longer available as it was in the previous iteration of this application. Before, it simply appeared (large size) on the face of your iPhone; now, you have to unlock your iPhone to find the snooze button. By the time you have gone through all those motions, youre pretty much awake and no longer feel the need to snooze an extra few minutes. Im using this on a new iPhone 5s, and – as mentioned above – have been using this application in his previous version quite successfully. I am very disappointed in how unreliable and useless as an alarm it has become with this last rendition. However, I think it is still the best ambient sound generator out there, and so will probably continue to use it along with a back-up alarm to compensate for its uselessness in that category. Therefore, Ive given it 2 stars, whereas before I would have given it a full five.