My biggest frustration is forgetting I took my Fitbit off and forgetting to put it back on. I can go all day without it on and not realize it.
Fitbit is already paired with my phone - I'd like a notification on my phone if the range of of my Fitbit exceeds a certain distance and the Fitbit has not logged any activity for a period of time.
I believe this would set the product apart from everyone else - the benefits of the product type are pointless if I don't even get to use them.
Moderator Edit: Clarified subject and updated labels