It's a neat device, nice display, long battery life.
However the few things it can do, it doesn't do well:
- sleep monitoring is not accurate; maybe I'm abnormal, but the device records 10-14 deep sleep periods in a night, sometimes when I've been fully awake; awake events are only occasionally recorded
- no "smart alarm" (alarm goes off when you're in a light sleep phase); third party apps don't work well
- the heartrate monitor is at best "approximate", and can frequently be *way* off
- the step counter isn't really any more accurate than my phone

I expect there are a huge number of these sitting in drawers after the novelty has worn off and the underlying utility shown to be deficient.

Bought this from eBay for $50. Overall first impressions were positive. However after wearing it for one week I noticed it gives innacurate readings on walking and heart rate monitoring. Everything else works fine. Has nice bright screen and very easy to use. Very responsive screen. Great battery life and can wear in the shower.

Wore 1 day and it burned my wrist 1cm / 1/2 cm almost healed 4 days later. It is caused by the pulse detection LED's that get very hot if using many pulse readouts. Apparently this happens with many Smart Watches. Emailed the manufacturer to see if I could get a User Manual they told me to go to the eBay seller...?? very disappointed with that reply.