The Fitbit FB403BK-WMT Flex 2 is a sleek, waterproof activity tracker that has garnered a mix of praise and criticism from its users. Here's a detailed look at what makes this device stand out and where it falls short.

Design and Comfort: Users love the small size and lightweight design of the Flex 2, making it comfortable for daily wear. Its waterproof feature allows for swimming, adding to its versatility. The ability to switch bands easily also lets users customize their look effortlessly.

Functionality: The Flex 2 excels in basic tracking features like step counting and call/text alerts, which help reduce phone usage. However, some users noted that the step counter can be inaccurate, possibly due to arm movements. The sleep tracker is less detailed compared to other models like the Alta HR.

Durability and Battery Life: Many users reported long-term durability, with some using it daily for over four years. However, battery life is a concern as it requires charging every other day. Some users also faced issues with charging defects and updating the device.

User Experience: While many appreciate its simplicity and ease of use, others faced challenges with defective units and complicated return processes. The lack of advanced features like stair tracking was a downside for some.

Overall, the Fitbit Flex 2 is a reliable choice for those seeking a basic, unobtrusive activity tracker with waterproof capabilities. However, potential buyers should be aware of its limitations in advanced tracking features and occasional technical issues.