I know there's problems with the sleep tracking, but people are more interested in their day activities. My children bought this device for my birthday, they were very worried about my health and severe weight issues, if my children were prepared to pay that amount I had to give it a go, it's changed my life completely, in 12 weeks I've managed to loose a mighty 36lb. From managing to do 1 mile in 35 mins to 1 mile in 15.7 mins, from only managing 1 mile a day to averaging 10 good miles a day. Of course this includes eating healthy. I have never exercised in my life and at 56 this is a first for me. Jawbone, Apple and most of all thanks to my kids for this magnificent piece of equipment.
Absolutely brilliant device. It seems to be very accurate at measuring steps and my sleep and is really motivational, especially with the app's daily insights which give you some personalised tips to help you live better. Make sure its worn on your non-dominant hand and make sure it isn't loose otherwise it can really throw the readings. Bought another for my dad for father's day!