Fitbit Onechat_bubble_outlineFrom real comments

Users consistently praise the Fitbit One's accuracy and battery life. Multiple commenters describe the device as accurate for steps and calories, sometimes off by only a small margin. One user lost 42 pounds using it for tracking, calling it easy to use with fast food logging once favorites are set. Battery life is repeatedly called excellent or insane, lasting a long time between charges, and customer service was praised for quickly replacing a lost unit with proof of purchase.

The clip-on design solves problems wrist-based trackers can't handle. Several users note that wrist trackers fail to register steps when arms don't swing, such as pushing carts, strollers, or doing dishes, and that the Fitbit One's waistband or bra clip works well in these cases. The separate wristband is meant only for sleep tracking, though some reviewers and commenters were confused by this, leading to inflated or inaccurate step and sleep readings when misused.

The tiny clip and fasteners are the device's biggest liability. Several users report losing the One multiple times or fearing they will lose it in the wash, describing the fasteners as cheap and flimsy. It is also not waterproof, ruling out swimming use, and lacks an altimeter so it cannot track floors climbed. Despite these drawbacks, some praised the ease of use, app integration, and even affordable used pricing on resale sites.