I cannot say enough about the Fitbit! I had the original one over three years ago and since I first received it as a gift, it is attached to me everyday like my head on my neck. When I first received it I was around 170 lbs (I'm a female and 5'4") and was able to get down to 130 lbs with the help and support it gave me. I would go for an extra walk to meet my daily goal or start jumping around and dancing in the house to up my fitness level. One time I even walked up and down the stairs in my house 100 times just to reach my next achievement to see what I climbed (happened to be the Eiffel Tower!). I highly recommend this product to anyone who is looking to get in shape and take control of their lives. I'm currently pregnant and can't wait to get back in shape (and I still wear it everyday to keep up a healthy pregnancy!). Also, the battery life is terrific, I usually go a week without charging it and it will let you know when it's low. I've tried using it for sleep but always forget to put on the wristband so my next upgrade will be to the new watch-like ones. I LOVE THIS PRODUCT!