I will summarize the disadvantages (all IMHO):
1. Clock display delay - can be cured by the firmware someday (I doubt it). I made a rule for myself - I turn my left hand with a bracelet so that the screen is almost 90 degrees, i. E. parallel to the face. Checked - with this method there are no brakes, the clock turns on in 99 cases out of a hundred. 2. I noticed the bracelet calculations during a long drive by car. As expected - unfortunately - after a certain time, the bracelet reported on the achievement of the daily "plan" of steps, although on that day I made a maximum of 500 of them))) Again, they can fix it in the next firmware. 3. Charge consumption defies clear logic. On average - 4-7 percent per day (which is not much, taking into account the total time of work). 4. Short alarm time per cycle. In a deep sleep, you simply won’t feel it, you won’t have time to wake up. 5. "Smart" alarm clock . Personally, I get by, it seems that there is an analogue of the program in the App Store (for iPhone, of course). 6. The bracelet sometimes arbitrarily turns on the backlight and immediately removes it (it will always be in the shower! ). On what depends - I do not know. 7. I will simultaneously attribute water resistance to both advantages and disadvantages. Someone complained that after swimming in the sea. STOP! EXACTLY IN THE SEA! But the moisture resistance class does not provide for BATHING in water bodies, especially with an aggressive environment (salt water). Maximum - washing hands and showers ! 8. Well, and a scratch screen. They write that it does not scratch, it is stable. Figu there! It scratches and is sometimes very painful. On the other hand, to cling to this small film screen (and they are) the top of insanity, because if you wear them all the time - frankly speaking, the view is , but in bright sunlight on the street, and so with a not very bright screen, you simply don’t have anything there see. 9. The bracelet provides for constant wear. The protruding lower part of the capsule (where the pulse sensors are located) after 4-5 days of wear leaves an unpleasant itchy imprint on the wrist. I admit that individually, but occasionally I still take off the bracelet.