Easy to use, very clear and large displays on my iphone 6S. The heart rate is captured from my Suunto belt (nice surprise) and shows a color code depending on how high you reach during your effort. I would give a 5 star under the following condition: a programmable BEEP signal when you reach a value of heart rate you could established in the set-up as an alarm.
Patrick0928 about LiveCycling, v2.10