I've had the Fitbit Ultra that I inherited from my niece when she got her Flex. Then I got DH the Flex for father's day but found he doesn't like to wear 'jewelry', so I traded him. (o:
The Ultra and the One have altimeters so they count flights of stairs. The Flex does not. The new Force has an altimeter, so it counts flights of stairs.
My niece has since upgraded to the Flex Force, she loves it! She works in an office and wears other bangles around the Force to dress it up. One thing to note, the Flex can be used with different color bands as the unit actually can be removed from the band. The Force is not removable from the band from my understanding.
I'm enjoying using the Fitbit and like that it does work 'cross platform' so to speak. I hope you find the unit that works best for what you want.
| Pounds lost: 6.0