I have the FitBit One.... I'm actually on my second one.... I dropped my first one in my pool without realizing it... and I ran out and bought a new one before I found it at the bottom of the deep end... and no, I wasn't trying to swim with it... lol... It just somehow became unclipped from my shorts... and I've almost lost the thing a few other times.... So if you do get one be careful...
Anyway.... It definitely has motivated me to be more "active".... I've actually been trying to walk 15,000 steps a day on top of my running and one day I even earned the badge for 20,000 steps... So now of course I want to earn the badge for 25,000 steps in a day... And I really love the floors climbed feature since I'm in NYC.... So one day I decided to go for the 100 floors climbed badge... And I actually climbed 115 flights of stairs in various buildings in one day.... So now of course I want to make an attempt for the next badge and go for 125 flights of stairs in a single day.... Although after looking on the FitBit site apparently there are some people who have done 200 flights of stairs in a single day! And needless to say I don't think I'll be earning that badge anytime soon...
I also like how it links with MFP and other various apps.... And I truly believe if I followed its calorie recommendations I would finally start making some progress toward losing the rest of this weight and make it to goal... But I always seem to want to be eating in my "maintenance" range.... lol... But when I stick with the calories it says I should be eating for the day... I lose... So I really am going to try to be more disciplined about that...