Recorded a workout on the 5X with the wrist HR while my 705 recorded my chest strap. The results over the 1:40:00 workout were very close:
HR Avg: strap: 161 5X: 162
HR Max: strap: 171 5X: 173
No complaints there.
What's odd is when a watch face is used that displays HR (outside of an activity). It seems that live HR isn't possible as the number displayed bears no relation to the current bpm, which makes it kind of useless for me.
I have also had the HR display field on the watch face disappear completely. Removing the face and adding it again sometimes fixed it. Another time, it just reappeared on its own.
Enabling gestures on the backlight didn't work at all yesterday, began working this morning and stopped again after noon. I tried setting it to 24 hour and military time to confirm that it didn't somehow think it was the middle of the night. Interestingly, raising and twisting my wrist does cause the second hand on 3rd party watch faces to reappear even when the backlight doesn't get triggered.
It can take a fairly strong movement to trigger gestures. I'd like it to be more sensitive or, better yet, adjustable. The screen looks fine outside but is really dim inside, hence the need for the backlight.
Battery life has been exceptional. 1% used while sleeping even with 1 sec HR recording. I'd trade battery life for a better screen and live updating on watch faces. If that can be enabled and gestures fixed, I'd be more content, though I do wish a brighter screen was possible. Compared to other smart watches, battery is great, screen is poor and the bugs so far fairly minor.
