Anyone using Fitbit One?

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Hello everyone! I started using Fitbit One a few days ago and would love to know anyone else that's using it... it seems really good, but I'm not sure how accurate it is if you do anything else that's NOT walking. I've been using its score for the walking/running and adding other exercises manually, like spinning or the elliptic machine. Any tips on its use?
I would love some motivational buddies as well... I have about 9 lbs to go before my wedding next year, so I really want to be looking and feeling my best!