Not bad, but quirkiness prevent a better rating. The activity and sleep tracking functions frequently lose data, particularly the sleep tracking. At most one or two days of sleep history is kept, with a lot of apparently empty slots appearing. The battery level indicator has only ever shown 100%, 90% or --%, causing the battery to run out without warning. Ive taken to charging the tracker every other day just to be safe.
If the app were less quirky, it would make these relatively inexpensive promotional activity trackers competitive with much more expensive fit bits and other similar devices. Id be able to sell a lot more of these things if the quirkiness of the app didnt cheapen the experience.
PromotionalProductsRep about Body Sensor