I've gotten some extra money this week that was totally unexpected, unbudgeted, and not needed for bills or vacation... I've wanted a Fitbit since reading about them. Are they really as good as they promise? I'm thinking of the One. I want the sleep tracker as well. I'm using MFP with great success (52 lbs lost and counting ) and want to have a more accurate count of daily activity/calories burned. So, would you recommend it?