As a fitness buff, I love my Fitbit one. The reason I chose this model was simple: I did not want to wear two wristwatches. I just clip the unit into my pocket and rarely look at it. I also use it to monitor my sleep patterns at night (it tells me that I don't sleep enough!). For me, the Fitbit motivates me to avoid long periods of sitting, which evidence is showing is truly detrimental to one's health.