Have had the Fitbit Flex less than 24 hours and so far I like it. It is particularly helpful for tracking walking/running. I also like it for sleep. According to research it can overestimate sleep by as much as 67 minutes. For a sale price of $100 Can it is a good incentive to keep up 10,000 steps a day. Well I like it so much I bought the company, 200 shares on broker recommendations.