Been using this for a month now and I love it! It keeps track of how much you sleep, what kind of exercise you are doing, and tells you when you are sitting too long to get up and get moving ! I wear it every day and it is very comfortable. It is waterproof and seems to withstand just about anything! I couldn't have made a better choice! I didn't get the heart monitor, but wish I would have just for the extra features, but overall still completely happy with it.