I just got myself a Fitbit Charge 2 this week and it has been tracking my every move. I find the band slightly thicker than I am used to and most people who never wear anything on their wrists would think the same. The charge is definitely more accurate than a waist pedometer measuring steps. The product is offered in various band sizes to cater to those with small, medium and large wrists. The clasp that holds the band is very adherent to the band and sometimes it is hard to slide it off. However, the fit bit has been pretty accurate in tracking my steps, activity, and heart rate with 3 sensors at the back.