Smart wake is a life saver.

Literally the only reason I use charge 6 for. Initially got it for its small design, because i just like small sexy things, but now the only thing stopping me from getting a Garmin is the smart wake feature (Garmins have inaccurate sleep tracking).

I went from sleeping 9 hours and still waking up groggy, to sleeping only 3 hours and waking up refreshed.