The only thing that's a bit of a bummer is the battery life (the Peak Basis claims 4 days and the Fitbit Surge claims 5 days) and the MS Band is only "Dust- and

The only thing that's a bit of a bummer is the battery life (the Peak Basis claims 4 days and the Fitbit Surge claims 5 days) and the MS Band is only "Dust- and splash-resistant" while those other devices are waterproof to 5ATM (usable for swimming), but the sheer number of sensors is really impressive and I'm much more confident about software/data access. At the very least it looks like MS Health pipes data into HealthVault, which is API accessible), but I'm most looking forward to getting access to the raw data stream (considering it's my biometric data they're collecting).