I bought a Fitbit One a few weeks ago - love it! It's a good extrinsic motivator and I find myself moving more to try to beat the previous days steps! I'm a bit of an insomniac so I like the fact it tracks my sleep also. The app is really good, the desktop version is fantastic. I find entering my food a bit tedious so have been slack with that, but I do log my weight. I kept testing the step counter when I first bought it and I find it to be very accurate. Really pleased I purchased it! I forgot to put it on after my shower the other day. I was going to the gym after school drop off, and I was so sad that I wouldn't track my exercise!! Highly recommend it