As many other reviews, I am giving this 1 star because the strap keeps coming loose. So much for "exercise anywhere". After numerous emails to customer service about this giving pointless advice on how to tighten a watchstrap, and then to say we must send it in for a quote. I don't think so. Once there is a better strap that gets designed for this, then I will upgrade my rating. Besides the strap, this is a very good device, really good stats and the app is quite good too! UPDATE: 8 months later and the strap has come apart. Apparently there is only a 6 month warranty on the strap, so they want to charge to repair this. Not happy at all.