Integration with things like MyFitnessPal and Fitbit would be great. i've found that the less data i have to manually enter the better i do. i've had a fitbit one and aria for about a month now and thats what i have found. i'm having a hard time imagining a scale the size of a bluetooth headset would work. it seems like something the size of a deck of playing card would be good. i dont know enough about the mechanics of a digital scale but i could see the utility of building it into an iphone case