The batch HR is solid, I'm wearing the device for about 10 days 24x7 (with continuous heart rate measurement). Battery life with me is more pronounced at 3-4 days (with a clear tendency to 3), but can be in 30 minutes easy recharge. The heart rate monitoring seems to me to be very precise in everyday life, just like the step and step measurement. Really great! I do 4-5x per week sports, much cardio workout while (only on devices in the studio). The measurement accuracy can thereby certainly something to be desired, sometimes it fits to 100% (compared to my Polar H7), for example, on an elliptical machine, sometimes 30-40 beats per minute below what the Polar Transmitter displays (rowing machine, exercise bike).
I pers. Find the iOS app an outstanding success, initial setup was very quick. Without Problems.
The vibrating alert is very convenient, but far from discreet ;-)
1 star deduction for the slightly worse battery life (as advertised) and for the measurement problems in cardio area.
