Love it with a little exception
I really enjoy using Sarah’s Timer-App for my workouts. Especially if you are doing her e-books, it is very practical. However, the only flaw is that when you leave the app to change your music or answer a message and then return to the app, the app unfortunately often resets the status of the timer and you have to start your timer all over again from the beginning. I don’t know if this is a app-bug or if my iPhone (8) is doing strange things. Other than that, I can recommend it a lot!