After a month and a half I am mostly pleased.
Battery life is fine, even when using the exercise tracking.
I have had intermittent issues with the GPS and gSensor.
Most of the time it works pretty quickly after selecting a workout, the time before you press Go.
Sometimes it can take quite a while to get the Go. I was in another city and exercise tracking did not work the whole time, GPS never locked. When I got home it started working again.
Yesterday in the middle of a workout tracking stopped. I had a ⅔ day of no step tracking, wake on wrist raise stopped. I rebooted, shut off, reset and still no luck. Then late afternoon it just started working again like magic. Still works well today.
I don’t use sleep tracking so can’t comment. The heart rate and blood O2 are the same as a finger sensor I have.