I walk and use stairs as :-), it's easy to see that the Fitbit is not accurate, the counting system is imprecise :-(
The web portal requires a significant personal investment.
The monitoring of sleep? What criteria you base it? Because my arm moves! It seems far-fetched as the unit of assessment.
I would like an assessment of the duration of my sleep cycles. The average time needed my sleep. So I can know what time to bed to wake me up more or less at the end of a cycle.
The battery life is excellent.
The size is excellent.
Continuous assessment ...