I find any and all fitness gadgets redundant. They are usually glorified pedometers and technology for the sake of technology. Okay, so it can sync your activity with your phone and tablet and you're all connected and shit - that's cool that it can do that - but so what? What's the end result here and does it really help you to achieve your goals over and above say, a $2 stopwatch or straight out dieting/exercising.
I feel like most people who buy these things think that it will help them to exercise more or give them an advantage when doing so. Instead you end up with people saying I did 20,000 steps today (like anyone else with an office job who runs errands). It's just another way out of good old fashioned hard work, not unlike buying a Wii Fit or some ab pro that does the sit-ups for you.
It's unbelievable how much these little things have taken off and all the companies jumping on board for the ride - probably the best example of trending I've seen in a long time, given only a few years ago we had wristwatch heart rate monitors (which *can* actually be useful during exercise) and garmin gps trackers and hardly anyone wanted a bar of that. Remember when those stupid power balance bands came out and everyone wanted the "cheap" / easy competitive advantage? Lulz were had.
I think that gadgetry *may* have it's place with the elite athlete and coach looking for proper biofeedback, but for the average person going for runs and heading to the gym it's a giant wank. Whatever does it for you though - if it actually makes you exercise then more power to you, but you shouldn't need a wristband to make you want to do that - if you do then the motivation simply won't last. If nothing else you've got a wrist worn alarm clock that the CIA can track you with.