"... Strikingly, one-third of users discard their devices after six months, according to research by Endeavour Partners, a consultancy. Some industry insiders speculate that the true number may be much higher than that. ...The novelty of being able to track your steps, calories or other metrics is appealing at first, but swiftly wears off. ..."
Full article - http://goo.gl/hR5LxJ