I think if you're motivated to be healthy/lose weight, it's a really good tool. That being said, after having one for two months, I'm realizing that I'm clearly not motivated and therefore the fitbit is just an uncomfortable high-tech bracelet. I'll keep it, though, and then if I ever do decide I want to switch things up, it will come in handy. One thing is that I do a lot of non-walking/running exercise and that means the fitbit (flex at least) doesn't track it, so it was kind of demoralizing to know that I'd work out for two hours yet get no credit for it, and sure, I can type that in manually, but that information doesn't count toward the friendly challenges that you have between friends and things, so it was kind of a bummer. I didn't pay for it though, it was a gift, so no harm.