Hi,
Myself and my wife have a Forerunner 305 each that we upload to the same Garmin Connect account. It's easy to differentiate the activities as we name each one based upon who uploaded it, and it's easy to manage from the same PC as we don't have to keep logging out etc.
If we were to have a vivofit each could we easily differentiate who uploaded what, or would the activity be somehow merged and therefore better as two different accounts?
Thanks,
Nige.