Love mine, had a Flex, after almost a year I lost it last week, it fell off my wrist-after documenting purchase and explanation Fitbit replaced it free (this is a one time thing). I have already bought a Charge- WHICH I LOVE! as it functions as a watch-, I can see all my numbers without checking my phone, it tells me who's calling me etc. We get credits through our insurance so having my Charge and my new Flex as a back up is important.