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Pro Integrates social features
Users can see their friends' activity, compete one-on-one, and earn badges.
Pro Battery lasts a week or more on a single charge
The battery is rated for 7 days, and has been tested up to 9 days by reviewers.
Pro Multifunction display
In addition to fitness metrics, a Fitbit Charge synced with a phone will display time and caller ID.
Pro Smart alarm wakes you up at the optimal time
The Charge tracks sleep cycles, and its alarm can be configured to take this into account, attempting to select an optimal wake time.
Con Flimsy two-prong wrist strap
Fitbit was expected to update their wrist strap with the Charge, but an upgraded buckle can only be purchased with Charge HR.