I lost my samsung belt but wanted to give Mi a try before reordering. It was great decision. Tracker have most of the thing but, you need to buy one of paid application (Notify & fitness in my case) to get its max potential. Step count are more accurate than Samsung and battery is incredibly good. Heart rate monitor is questionable at time while you move or exercise. Sleep tracking with paid app is very good. All in all, a perfect tracker for your health if you are not into only running (no GPS).