This update has four major improvements.
Second, the code has been moved to iOS7. IOS7 is such a large change from iOS6 that it made sense to just move to 7. The app is more stable as a result, and unlike iOS6, almost all devices can upgrade. The user interface has been reworked so it is cleaner, lighter, and more elegant. (We pulled the app from sale back in September shortly after iOS7 came out, once we noticed it didn't work well with iOS7, as we didn't want folks getting a bad first impression.)