I bought this band 4 months back and I must say mi is doing a fantastic job. This band works awesome and its military grade sensor is almost very accurate and works quite well but the most impressive thing in its battery life. Just charge it full and u will get almost 40days battery backup. Also the app user interface is quite good as compared to others. In my opinion for 799 it is almost a jackpot for fitness lovers. I am very much satisfied with the performance.