I've had mine since July 2nd, and I agree w/ PP, it is a great tool to motivate you. I have it synched to MyFitnessPal and my iphone, and it so great to be able to track where I am for calories and activities. I've lost 6 pounds since the 2nd, and there is no way that would have happened w/o the constant positive feedback. I had no idea I was as active as I actually am, but w/ the flex and MyFitnessPal I've been eating 1800 calories a day and losing. Before the flex I would have just assumed I was eating too much at that calorie level, and then KEPT eating, thus no weight loss.
My husband went from an average of 3000 steps a day to > 10,000...just because he wants to see the lights all flash.