I was the Fuse million once not called Activity Tracker. You have to see for the time being, the Mio is primarily a producer HR sensor, which sensor can be found in the equipment of Adidas un TomTom. Fuse is truly an accurate HR sensor, which also include an accelerometer, which also includes steps (but only dan steps). Thanks to the eigebautem memory is einsatzbar as an independent unit, which operates independently as a fitness bracelet. The sensor (but only the HR Sensor) can be coupled with other devices over BTLE or Ant +, which then take on the heart rate. That really is a sensor producer in Mio, you can also see on the iOS app that supports only the necessary functions such as adjust the step-count log and workout. No direct interaction between the app and other apps incl. Apple Healt Kit unfortunately is possible to-time, so you can just couple the HR sensor itself with Angeles apps and devices. The has no own Internet portal, where you would see the history and keep the data after reading the Fuse only stored locally on the iPhone. There is also no social sharing function and the range of the workout you can categorize the workouts is very limited, even receive not the Gym (the Fuse on the first point to very good use as a Gym-Fitness Tracker is). From the food log can only dream. Fuse is also very good at swimming available, you can use the HR sensor with a fitness clock when swimming or Fuse also autonomously. Conclusion - man must above all know what one buys his Tracker. Fuse is certainly not an all-day activity - Tracker and not a fashion - Item. If man wants to use it while running, swimming or gymnastics as a tracker or as an external HR sensor, it is a very good device. I have studied the market long, why did I buy Fuse, and therefore my expectations are met. Fuse is an ideal workout supplement to my Pebble, which I then use during the day for me ..