Fitbit Surge is the fitness tracker that has so many new features, the start-up company behind it calls it a superwatch next to the more normal Fitbit Charge and Fitbit Charge HR. There's good reason for that label. The final version I tested has built-in GPS, a heart-rate monitor and real-time workout data, all fan-requested capabilities that raise the price. It's certainly a step up from the Fitbit Force that was recalled for causing skin allergies and never saw its promised smartwatch functionality, though a few rashes have been reported.