I have been using UP in one form or another for about three years. I have seen significant improvements in the software, firmware, and hardware. It's unfortunate that Jawbone is discontinuing hardware development, but assures that software updates will continue. As others have stated, there is no continuous HR feature. I only use the sleep and activity trackers in the app. If I was trying to lose weight, I would use the calorie portion as well. The app is a great motivator for me and I use it daily. Worth a go!