So, I took two walks today and used my Fitbit differently for both to see how the accuracy was. The first Walk was my regular one and my other apps said I walked further than the Fitbit did. The later walk, I actually tracked the walk with my Fitbit and with another fitness app. The Fitbit had less distance. I don't know why it's off, but it's not as bad as the other one. This one does better on my sleep too. I know that the distance was really off on the Charge, because I walked on the Riverwalk trail and it has markers every 1/4 mile. I actually walked further than it said I did. I guess I'll get used to the difference from my One. Other than that, I love everything about this tracker. It's nice to have it always on so I always have a watch on. I am hoping that it might get better with tracking my activity after I've had it awhile. I've only been wearing this one for two days so it might just need time to get in stride with me!