Technically very good, nice design, comfort on the wrist. The site (currently in beta) Polar Flow is not bad, it deserves improvements that should not delay. Only negative point for the shows, the back of metal dial that will eventually oxidized if the watch is not rinsed and dried thoroughly after each exercise. Garmin had made the same mistake with his Forerunner 600 and had replaced the back of the dial from the model 610.