I have the upgrade to unlock all functions like the paid app: This is a great app to record your workout sets. Definitely beats having to carry a notebook around. This shows the improvements and gains made over time. Con - being a fitness app this is lacking the ability to connect a HR monitor to calculate calories burned a bit more accurately. This is also lacking HealthKit integration to collect fitness data like bodyweight, HR, workout time, etc ****Another negative is that the apple watch settings dont completely match iPhone settings. I have supersets off on my iPhone settings, but the apple watch still shows the option for superset and taking my 3rd timer off. (PLEASE FIX THIS) Adding external device integration & HealthKit support will open up a lot more. For now this simply is simply a paper and pencil tracker in a digital way.