I've never been a big fan of stuff like this unless you're like a marathon runner or really know what your goals are. Ever since the days of the pedometer, I've always felt like it gives people who don't really know how to exercise an excuse to stop after a certain number.
I've trained a couple of people in working out from the pure basics of exercise...those who have never really worked out and the biggest hurdle to get past with them is finding what your limits are. Simple stuff like running on a treadmill or doing shoulder presses or sit ups. When it starts to hurt, they tend to stop, but pushing past the barrier is where you see results. Similarly, it's like doing 3 sets of 10. For those that don't truly know how to calculate their max and 80% of that and how to move up and down in weights, they're just getting to 10 and could probably push out a few more, but because they've hit 10, then stop.
With stuff like this, people see a number and feel like it's good enough. This seems like a huge fluke as far as numbers go. In one of the preview videos, it shows a DJ spinning discs and the numbers increasing. I'm a pretty laid back person and a bit of a home body, I don't go out that often and my job, when it's slow, consists of sitting in a car for 7 hours a day, but yet I work out for probably two hours a day and am healthier than probably 90% of my peers. But those who live in a big city, walk to work, walk up and down stairs, go out at night and are on their feet for majority of the day will easily have a higher number than me, but could be far less healthy based on simple things like coffee intake, diet, sleep, stress and exercise routine.
I agree with what you are saying, but anything that gets people interested in moving around more and if a wrist band does that for them, I think it is great. Back when I was chunkier I thought about getting one when I first started to exercise and eat better, but now that I have been in a routine for a while, I have no need and think it would annoy me more than anything. My suggestion would be to get in an exercise routine, and stick with it for 6 months and you will just keep doing it, because that is what you do. Motivation and determination will get you far further than a wrist band. And it's cheaper
"Son, what are you doing sleeping in my daughter's dormroom?"
-"Uhhhhh, i got to go, im late for class."
-"Its Saturday morning."
-"Then im really late for class. Where are my pants?"