I bought this product when it launched in India. Using for almost 8 months now. So far ok with product.
Pros:
Good display
5 days battery backup during normal usage
Good sleep tracking
Waterproof
High Oxygen Variation in blood can be tracked
Snore detect( beta)
Good design style and finish
Music storage
Cons:
Lack of in built GPS
Lack of some come feature compatibility with IOS
Poor Music controls
Lack of enough thrird party apps.
Its more kind of a fitness tracker than smart watch
Conclusion:
If you have an Android phone would like to have a fitness tracker with some smart watch feature go for it. If you are hard core smart watch fan or have a iphone and have enough money to spend you can go for apple Watch.