Well have been using this since 4 months.product concept is good but need lot of improvment. Say if you are having mi phone then only you get vibrating call notification not for other brands.
With clock display and heart rate monitor this piece will be amazing. Which will be available in next version.
Need improvment in supplied belt quality if you use its in water the its likely to break. It hapled with me.
Overall in given price rage product is good and recommended to health conscious consumers.