Most of the devices can tell you exactly how far you ran, how high your heart rate goes during a workout, and how active you've been during a day. ... In short: If you don't care exactly how many steps you've taken today or measuring your heart rate over time, a Fitbit probably isn't worth it for you.

Is Fitbit worth buying?

I highly recommend it to others who like data as much as I do as well. The metrics have been super helpful for me to gauge my activity levels and what I'm doing well and what I can improve upon. At the end of the day, however, a Fitbit is a luxury and it is more than possible to track your fitness levels without one.

What is bad about the Fitbit?

Some of the different models have gotten bad reputations for causing skin irritation, burns, and wrist pain. Some of these were attributed to allergic reactions to the metals used, but many other symptoms from wearing Fitbit fitness trackers can easily be attributed to the EMF radiation from the devices.