Hi guys. I wanted to get myself a nice activity tracker for Xmas. I have been using the fuelband but now I want more info. I was considering either a fitbit or a polar m400(GPS watch with activity tracking). Then again I own an iPhone 6 and have come to see I can get most of the info out of it. Steps with fitbit app, calorie tracking with mfp, sleep tracking, and even got and GPS workout tracking with hr using polar beat. So... Does it even make sense to own an activity tracker after the iPhone 6?