Slightly OT, I used to obsess about the accuracy and actual data that these devices provide (had a BodyMedia FIT and now a FitBit), until I realized that the da

Slightly OT, I used to obsess about the accuracy and actual data that these devices provide (had a BodyMedia FIT and now a FitBit), until I realized that the data itself isn't what I'm most interested in. IMHO the main draw for these devices is their ability to motivate me to be more active, sleep better, etc. Historical data is interesting, but not crucial to that function (although I'd like to see FitBit make the data available). Far more important are real-time feedback mechanisms, such as notices that I achieved a goal, motivating messages ("you're almost there"), etc.