I sooooo wanted to get a Fitbit but I read the reviews. Didn't get it!!! I've heard time and again that the calorie burn is grossly underestimated. I have a Polar FT4. It works fine but I'm really interested in the Fitbit capabilities of tracking steps, calories in and burned, sleep etc. I like the idea of syncing it onto another device and seeing a graph of my workouts. All of this is not on my polar but....I read somewhere that the Fitbit is really best used for runners. I hope others chime in too.