Although I was happy having used this app in the gym to track my workouts, it now fails to check-in on older versions.
Compatibility has been broken somewhere during the migration to iOS 7. This leaves users of older iDevices or those that cannot upgrade otherwise in the dark. I cannot think of a feature that would require the 7.x libraries over 6.x, but the App Store offers no (developer left no) alternative and demands you to upgrade. Guess I'm better of using a spreadsheet app to stay in control over my data -- historic as well as in the future...