The Nike Fuelband is a wearable device that can track your daily steps as well as your active calories and how many hours you've been active each day. On top of that it also lets you earn something called "Nike Fuel" and you can set a goal amount of fuel to earn everyday. I don't have a clue how the algorithm that measures how much "fuel" you've earned works but trying to reach your daily fuel goal can become very addicting (believe me I know).
The Nike Fuelband that I use isn't super accurate at tracking my steps (usually off by a couple thousand steps) but that's not the main reason I why I got it in the first place. I got my Nike Fuelband because of the Nike Fuel goals. Something about trying to earn as much fuel as possible everyday has really driven me to be as active everyday as possible. My daily fuel goal is 3,500 fuel and I am now at over 1.2 million total fuel earned which is always satisfying to look at.
I know there are plenty of people out there that hated and returned their Nike Fuelband (or just threw it away) but I have been very happy with it for the most part. Even though the total daily steps aren't accurate, I don't really care because there's better ways to measure your steps anyways.
Overall, if I had to give a grade, I would give the Nike Fuelband a B+ because it has done a great job at keeping me up and active but it would be a lot better if the steps counter wasn't so inaccurate.